{
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    "backrank": "BBQNNRKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
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      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "fh"
    },
    "mirror_twin": 959
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    "backrank": "BQNBNRKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ce",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "fh"
    },
    "mirror_twin": 955
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  "10": {
    "backrank": "QNNRBBKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "bc",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "dh"
    },
    "mirror_twin": 949
  },
  "100": {
    "backrank": "QBBNRNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "eh"
    },
    "mirror_twin": 862
  },
  "101": {
    "backrank": "QNBBRNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "bf",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "eh"
    },
    "mirror_twin": 858
  },
  "102": {
    "backrank": "QNBRNBKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 4,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "be",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "dh"
    },
    "mirror_twin": 854
  },
  "103": {
    "backrank": "QNBRNKRB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "be",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "dg"
    },
    "mirror_twin": 850
  },
  "104": {
    "backrank": "QBNRBNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "dh"
    },
    "mirror_twin": 861
  },
  "105": {
    "backrank": "QNRBBNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "bf",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "ch"
    },
    "mirror_twin": 857
  },
  "106": {
    "backrank": "QNRNBBKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "bd",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "ch"
    },
    "mirror_twin": 853
  },
  "107": {
    "backrank": "QNRNBKRB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "bd",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "cg"
    },
    "mirror_twin": 849
  },
  "108": {
    "backrank": "QBNRNKBR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ce",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "dh"
    },
    "mirror_twin": 860
  },
  "109": {
    "backrank": "QNRBNKBR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "be",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "ch"
    },
    "mirror_twin": 856
  },
  "11": {
    "backrank": "QNNRBKRB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "bc",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "dg"
    },
    "mirror_twin": 945
  },
  "110": {
    "backrank": "QNRNKBBR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "bd",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "ch"
    },
    "mirror_twin": 852
  },
  "111": {
    "backrank": "QNRNKRBB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "bd",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "cf"
    },
    "mirror_twin": 848
  },
  "112": {
    "backrank": "BBNQRNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "eh"
    },
    "mirror_twin": 847
  },
  "113": {
    "backrank": "BNQBRNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "bf",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "eh"
    },
    "mirror_twin": 843
  },
  "114": {
    "backrank": "BNQRNBKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "be",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 839
  },
  "115": {
    "backrank": "BNQRNKRB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "be",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "dg"
    },
    "mirror_twin": 835
  },
  "116": {
    "backrank": "NBBQRNKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "eh"
    },
    "mirror_twin": 846
  },
  "117": {
    "backrank": "NQBBRNKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "eh"
    },
    "mirror_twin": 842
  },
  "118": {
    "backrank": "NQBRNBKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ae",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 838
  },
  "119": {
    "backrank": "NQBRNKRB",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ae",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "dg"
    },
    "mirror_twin": 834
  },
  "12": {
    "backrank": "QBNNRKBR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "cd",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "eh"
    },
    "mirror_twin": 956
  },
  "120": {
    "backrank": "NBQRBNKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 845
  },
  "121": {
    "backrank": "NQRBBNKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 841
  },
  "122": {
    "backrank": "NQRNBBKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ad",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 837
  },
  "123": {
    "backrank": "NQRNBKRB",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ad",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "cg"
    },
    "mirror_twin": 833
  },
  "124": {
    "backrank": "NBQRNKBR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ae",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 844
  },
  "125": {
    "backrank": "NQRBNKBR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ae",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 840
  },
  "126": {
    "backrank": "NQRNKBBR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "ad",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 836
  },
  "127": {
    "backrank": "NQRNKRBB",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "ad",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "cf"
    },
    "mirror_twin": 832
  },
  "128": {
    "backrank": "BBNRQNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 831
  },
  "129": {
    "backrank": "BNRBQNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "bf",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 827
  },
  "13": {
    "backrank": "QNNBRKBR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "bc",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "eh"
    },
    "mirror_twin": 952
  },
  "130": {
    "backrank": "BNRQNBKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 4,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "be",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 823
  },
  "131": {
    "backrank": "BNRQNKRB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "be",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "cg"
    },
    "mirror_twin": 819
  },
  "132": {
    "backrank": "NBBRQNKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 830
  },
  "133": {
    "backrank": "NRBBQNKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 826
  },
  "134": {
    "backrank": "NRBQNBKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 4,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ae",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 822
  },
  "135": {
    "backrank": "NRBQNKRB",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ae",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 818
  },
  "136": {
    "backrank": "NBRQBNKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 829
  },
  "137": {
    "backrank": "NRQBBNKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 825
  },
  "138": {
    "backrank": "NRQNBBKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ad",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 821
  },
  "139": {
    "backrank": "NRQNBKRB",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ad",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 817
  },
  "14": {
    "backrank": "QNNRKBBR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "bc",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "dh"
    },
    "mirror_twin": 948
  },
  "140": {
    "backrank": "NBRQNKBR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ae",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 828
  },
  "141": {
    "backrank": "NRQBNKBR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ae",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 824
  },
  "142": {
    "backrank": "NRQNKBBR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "ad",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 820
  },
  "143": {
    "backrank": "NRQNKRBB",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "ad",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bf"
    },
    "mirror_twin": 816
  },
  "144": {
    "backrank": "BBNRNQKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ce",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 815
  },
  "145": {
    "backrank": "BNRBNQKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "be",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 811
  },
  "146": {
    "backrank": "BNRNQBKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "bd",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 807
  },
  "147": {
    "backrank": "BNRNQKRB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "bd",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "cg"
    },
    "mirror_twin": 803
  },
  "148": {
    "backrank": "NBBRNQKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ae",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 814
  },
  "149": {
    "backrank": "NRBBNQKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ae",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 810
  },
  "15": {
    "backrank": "QNNRKRBB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "bc",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "df"
    },
    "mirror_twin": 944
  },
  "150": {
    "backrank": "NRBNQBKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ad",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 806
  },
  "151": {
    "backrank": "NRBNQKRB",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ad",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 802
  },
  "152": {
    "backrank": "NBRNBQKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ad",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 813
  },
  "153": {
    "backrank": "NRNBBQKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ac",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 809
  },
  "154": {
    "backrank": "NRNQBBKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ac",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 805
  },
  "155": {
    "backrank": "NRNQBKRB",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ac",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 801
  },
  "156": {
    "backrank": "NBRNQKBR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ad",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 812
  },
  "157": {
    "backrank": "NRNBQKBR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ac",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 808
  },
  "158": {
    "backrank": "NRNQKBBR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "ac",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 804
  },
  "159": {
    "backrank": "NRNQKRBB",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "ac",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "bf"
    },
    "mirror_twin": 800
  },
  "16": {
    "backrank": "BBNQNRKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ce",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "fh"
    },
    "mirror_twin": 943
  },
  "160": {
    "backrank": "BBNRNKQR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ce",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 799
  },
  "161": {
    "backrank": "BNRBNKQR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "be",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 795
  },
  "162": {
    "backrank": "BNRNKBQR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "bd",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 791
  },
  "163": {
    "backrank": "BNRNKQRB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "bd",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "cg"
    },
    "mirror_twin": 787
  },
  "164": {
    "backrank": "NBBRNKQR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ae",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 798
  },
  "165": {
    "backrank": "NRBBNKQR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ae",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 794
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  "166": {
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  "198": {
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  "199": {
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      "rook_files": "eh"
    },
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    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
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      "bishop_corner": false,
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      "knight_files": "ae",
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      "queen_file": "d",
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      "rook_files": "fh"
    },
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    "backrank": "QBNRBKNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
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      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
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      "king_band": "mid",
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      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "dh"
    },
    "mirror_twin": 669
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  "201": {
    "backrank": "QNRBBKNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
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      "king_band": "mid",
      "king_file": "f",
      "knight_files": "bg",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "ch"
    },
    "mirror_twin": 665
  },
  "202": {
    "backrank": "QNRKBBNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "bg",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "ch"
    },
    "mirror_twin": 661
  },
  "203": {
    "backrank": "QNRKBNRB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "bf",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "cg"
    },
    "mirror_twin": 657
  },
  "204": {
    "backrank": "QBNRKNBR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "dh"
    },
    "mirror_twin": 668
  },
  "205": {
    "backrank": "QNRBKNBR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "bf",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "ch"
    },
    "mirror_twin": 664
  },
  "206": {
    "backrank": "QNRKNBBR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "be",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "ch"
    },
    "mirror_twin": 660
  },
  "207": {
    "backrank": "QNRKNRBB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "be",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "cf"
    },
    "mirror_twin": 656
  },
  "208": {
    "backrank": "BBNQRKNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "cg",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "eh"
    },
    "mirror_twin": 655
  },
  "209": {
    "backrank": "BNQBRKNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "bg",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "eh"
    },
    "mirror_twin": 651
  },
  "21": {
    "backrank": "NQBBNRKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ae",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "fh"
    },
    "mirror_twin": 938
  },
  "210": {
    "backrank": "BNQRKBNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 3,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "bg",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 647
  },
  "211": {
    "backrank": "BNQRKNRB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "bf",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "dg"
    },
    "mirror_twin": 643
  },
  "212": {
    "backrank": "NBBQRKNR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 4,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ag",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "eh"
    },
    "mirror_twin": 654
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  "213": {
    "backrank": "NQBBRKNR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ag",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "eh"
    },
    "mirror_twin": 650
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  "214": {
    "backrank": "NQBRKBNR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 3,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "ag",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 646
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  "215": {
    "backrank": "NQBRKNRB",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
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      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
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      "king_band": "central",
      "king_file": "e",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "dg"
    },
    "mirror_twin": 642
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  "216": {
    "backrank": "NBQRBKNR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
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      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
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      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ag",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 653
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  "217": {
    "backrank": "NQRBBKNR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
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      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ag",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 649
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  "218": {
    "backrank": "NQRKBBNR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
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      "king_band": "central",
      "king_file": "d",
      "knight_files": "ag",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 645
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  "219": {
    "backrank": "NQRKBNRB",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 8,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "cg"
    },
    "mirror_twin": 641
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  "22": {
    "backrank": "NQBNRBKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ad",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "eh"
    },
    "mirror_twin": 934
  },
  "220": {
    "backrank": "NBQRKNBR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 652
  },
  "221": {
    "backrank": "NQRBKNBR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 648
  },
  "222": {
    "backrank": "NQRKNBBR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ae",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 644
  },
  "223": {
    "backrank": "NQRKNRBB",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 8,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ae",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "cf"
    },
    "mirror_twin": 640
  },
  "224": {
    "backrank": "BBNRQKNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "cg",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 639
  },
  "225": {
    "backrank": "BNRBQKNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "bg",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 635
  },
  "226": {
    "backrank": "BNRQKBNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 2,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "bg",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 631
  },
  "227": {
    "backrank": "BNRQKNRB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "bf",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "cg"
    },
    "mirror_twin": 627
  },
  "228": {
    "backrank": "NBBRQKNR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ag",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 638
  },
  "229": {
    "backrank": "NRBBQKNR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ag",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 634
  },
  "23": {
    "backrank": "NQBNRKRB",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ad",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "eg"
    },
    "mirror_twin": 930
  },
  "230": {
    "backrank": "NRBQKBNR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 2,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "ag",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 630
  },
  "231": {
    "backrank": "NRBQKNRB",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 626
  },
  "232": {
    "backrank": "NBRQBKNR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ag",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 637
  },
  "233": {
    "backrank": "NRQBBKNR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ag",
      "knight_placement": "rim",
      "queen_file": "c",
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      "rook_files": "bh"
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    "mirror_twin": 633
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  "234": {
    "backrank": "NRQKBBNR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
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      "bishop_corner": false,
      "bishop_files": "ef",
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      "king_band": "central",
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      "knight_files": "ag",
      "knight_placement": "rim",
      "queen_file": "c",
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      "rook_files": "bh"
    },
    "mirror_twin": 629
  },
  "235": {
    "backrank": "NRQKBNRB",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
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      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 8,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 625
  },
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    "backrank": "NBRQKNBR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
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      "adjacent_rooks": false,
      "bishop_corner": false,
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      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "d",
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      "rook_files": "ch"
    },
    "mirror_twin": 636
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  "237": {
    "backrank": "NRQBKNBR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
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      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
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      "king_band": "central",
      "king_file": "e",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 632
  },
  "238": {
    "backrank": "NRQKNBBR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ae",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 628
  },
  "239": {
    "backrank": "NRQKNRBB",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
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      "king_band": "central",
      "king_file": "d",
      "knight_files": "ae",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bf"
    },
    "mirror_twin": 624
  },
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    "backrank": "NBQNBRKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
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      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ad",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "fh"
    },
    "mirror_twin": 941
  },
  "240": {
    "backrank": "BBNRKQNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "cg",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 623
  },
  "241": {
    "backrank": "BNRBKQNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
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      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "bg",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 619
  },
  "242": {
    "backrank": "BNRKQBNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "bg",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 615
  },
  "243": {
    "backrank": "BNRKQNRB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "bf",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "cg"
    },
    "mirror_twin": 611
  },
  "244": {
    "backrank": "NBBRKQNR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "ag",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 622
  },
  "245": {
    "backrank": "NRBBKQNR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "ag",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 618
  },
  "246": {
    "backrank": "NRBKQBNR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
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      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
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      "king_band": "central",
      "king_file": "d",
      "knight_files": "ag",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 614
  },
  "247": {
    "backrank": "NRBKQNRB",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 610
  },
  "248": {
    "backrank": "NBRKBQNR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ag",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 621
  },
  "249": {
    "backrank": "NRKBBQNR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "ag",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 617
  },
  "25": {
    "backrank": "NQNBBRKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
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      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ac",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "fh"
    },
    "mirror_twin": 937
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  "250": {
    "backrank": "NRKQBBNR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 4,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "ag",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 613
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  "251": {
    "backrank": "NRKQBNRB",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 609
  },
  "252": {
    "backrank": "NBRKQNBR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 620
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  "253": {
    "backrank": "NRKBQNBR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 616
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  "254": {
    "backrank": "NRKQNBBR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "ae",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 612
  },
  "255": {
    "backrank": "NRKQNRBB",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "ae",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "bf"
    },
    "mirror_twin": 608
  },
  "256": {
    "backrank": "BBNRKNQR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 607
  },
  "257": {
    "backrank": "BNRBKNQR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "bf",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 603
  },
  "258": {
    "backrank": "BNRKNBQR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "be",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 599
  },
  "259": {
    "backrank": "BNRKNQRB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "be",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "cg"
    },
    "mirror_twin": 595
  },
  "26": {
    "backrank": "NQNRBBKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ac",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 933
  },
  "260": {
    "backrank": "NBBRKNQR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 606
  },
  "261": {
    "backrank": "NRBBKNQR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 602
  },
  "262": {
    "backrank": "NRBKNBQR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ae",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 598
  },
  "263": {
    "backrank": "NRBKNQRB",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ae",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 594
  },
  "264": {
    "backrank": "NBRKBNQR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 605
  },
  "265": {
    "backrank": "NRKBBNQR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 601
  },
  "266": {
    "backrank": "NRKNBBQR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "ad",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 597
  },
  "267": {
    "backrank": "NRKNBQRB",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "ad",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 593
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  "300": {
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      "king_band": "central",
      "king_file": "e",
      "knight_files": "bg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "cf"
    },
    "mirror_twin": 299
  },
  "37": {
    "backrank": "NNBBQRKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "fh"
    },
    "mirror_twin": 922
  },
  "370": {
    "backrank": "BNRKRBNQ",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "bg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ce"
    },
    "mirror_twin": 295
  },
  "371": {
    "backrank": "BNRKRNQB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "bf",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ce"
    },
    "mirror_twin": 291
  },
  "372": {
    "backrank": "NBBRKRNQ",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "ag",
      "knight_placement": "rim",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "df"
    },
    "mirror_twin": 302
  },
  "373": {
    "backrank": "NRBBKRNQ",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "ag",
      "knight_placement": "rim",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "bf"
    },
    "mirror_twin": 298
  },
  "374": {
    "backrank": "NRBKRBNQ",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ag",
      "knight_placement": "rim",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "be"
    },
    "mirror_twin": 294
  },
  "375": {
    "backrank": "NRBKRNQB",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "be"
    },
    "mirror_twin": 290
  },
  "376": {
    "backrank": "NBRKBRNQ",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ag",
      "knight_placement": "rim",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "cf"
    },
    "mirror_twin": 301
  },
  "377": {
    "backrank": "NRKBBRNQ",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "ag",
      "knight_placement": "rim",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "bf"
    },
    "mirror_twin": 297
  },
  "378": {
    "backrank": "NRKRBBNQ",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "ag",
      "knight_placement": "rim",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "bd"
    },
    "mirror_twin": 293
  },
  "379": {
    "backrank": "NRKRBNQB",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "bd"
    },
    "mirror_twin": 289
  },
  "38": {
    "backrank": "NNBQRBKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 3,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "eh"
    },
    "mirror_twin": 918
  },
  "380": {
    "backrank": "NBRKRNBQ",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 8,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ce"
    },
    "mirror_twin": 300
  },
  "381": {
    "backrank": "NRKBRNBQ",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "af",
      "knight_placement": "rim",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "be"
    },
    "mirror_twin": 296
  },
  "382": {
    "backrank": "NRKRNBBQ",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "ae",
      "knight_placement": "rim",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "bd"
    },
    "mirror_twin": 292
  },
  "383": {
    "backrank": "NRKRNQBB",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "ae",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "bd"
    },
    "mirror_twin": 288
  },
  "384": {
    "backrank": "BBQRNNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 767
  },
  "385": {
    "backrank": "BQRBNNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 763
  },
  "386": {
    "backrank": "BQRNNBKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 759
  },
  "387": {
    "backrank": "BQRNNKRB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "cg"
    },
    "mirror_twin": 755
  },
  "388": {
    "backrank": "QBBRNNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "dh"
    },
    "mirror_twin": 766
  },
  "389": {
    "backrank": "QRBBNNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bh"
    },
    "mirror_twin": 762
  },
  "39": {
    "backrank": "NNBQRKRB",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "eg"
    },
    "mirror_twin": 914
  },
  "390": {
    "backrank": "QRBNNBKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bh"
    },
    "mirror_twin": 758
  },
  "391": {
    "backrank": "QRBNNKRB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bg"
    },
    "mirror_twin": 754
  },
  "392": {
    "backrank": "QBRNBNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "ch"
    },
    "mirror_twin": 765
  },
  "393": {
    "backrank": "QRNBBNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bh"
    },
    "mirror_twin": 761
  },
  "394": {
    "backrank": "QRNNBBKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "cd",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bh"
    },
    "mirror_twin": 757
  },
  "395": {
    "backrank": "QRNNBKRB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "cd",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bg"
    },
    "mirror_twin": 753
  },
  "396": {
    "backrank": "QBRNNKBR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "ch"
    },
    "mirror_twin": 764
  },
  "397": {
    "backrank": "QRNBNKBR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ce",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bh"
    },
    "mirror_twin": 760
  },
  "398": {
    "backrank": "QRNNKBBR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "cd",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bh"
    },
    "mirror_twin": 756
  },
  "399": {
    "backrank": "QRNNKRBB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "cd",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bf"
    },
    "mirror_twin": 752
  },
  "4": {
    "backrank": "QBBNNRKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "fh"
    },
    "mirror_twin": 958
  },
  "40": {
    "backrank": "NBNQBRKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ac",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "fh"
    },
    "mirror_twin": 925
  },
  "400": {
    "backrank": "BBRQNNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 751
  },
  "401": {
    "backrank": "BRQBNNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 747
  },
  "402": {
    "backrank": "BRQNNBKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 743
  },
  "403": {
    "backrank": "BRQNNKRB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 739
  },
  "404": {
    "backrank": "RBBQNNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 4,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 750
  },
  "405": {
    "backrank": "RQBBNNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 746
  },
  "406": {
    "backrank": "RQBNNBKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 4,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 742
  },
  "407": {
    "backrank": "RQBNNKRB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 738
  },
  "408": {
    "backrank": "RBQNBNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 749
  },
  "409": {
    "backrank": "RQNBBNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 745
  },
  "41": {
    "backrank": "NNQBBRKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "fh"
    },
    "mirror_twin": 921
  },
  "410": {
    "backrank": "RQNNBBKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "cd",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 741
  },
  "411": {
    "backrank": "RQNNBKRB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "cd",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 737
  },
  "412": {
    "backrank": "RBQNNKBR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 748
  },
  "413": {
    "backrank": "RQNBNKBR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ce",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 744
  },
  "414": {
    "backrank": "RQNNKBBR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "cd",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 740
  },
  "415": {
    "backrank": "RQNNKRBB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "cd",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 736
  },
  "416": {
    "backrank": "BBRNQNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 735
  },
  "417": {
    "backrank": "BRNBQNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 731
  },
  "418": {
    "backrank": "BRNQNBKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ce",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 727
  },
  "419": {
    "backrank": "BRNQNKRB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ce",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 723
  },
  "42": {
    "backrank": "NNQRBBKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 917
  },
  "420": {
    "backrank": "RBBNQNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 734
  },
  "421": {
    "backrank": "RNBBQNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 4,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "bf",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 730
  },
  "422": {
    "backrank": "RNBQNBKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 2,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "be",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 726
  },
  "423": {
    "backrank": "RNBQNKRB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 4,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "be",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 722
  },
  "424": {
    "backrank": "RBNQBNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 733
  },
  "425": {
    "backrank": "RNQBBNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "bf",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 729
  },
  "426": {
    "backrank": "RNQNBBKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 4,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "bd",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 725
  },
  "427": {
    "backrank": "RNQNBKRB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "bd",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 721
  },
  "428": {
    "backrank": "RBNQNKBR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ce",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 732
  },
  "429": {
    "backrank": "RNQBNKBR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "be",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 728
  },
  "43": {
    "backrank": "NNQRBKRB",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "dg"
    },
    "mirror_twin": 913
  },
  "430": {
    "backrank": "RNQNKBBR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 3,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "bd",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 724
  },
  "431": {
    "backrank": "RNQNKRBB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "bd",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 720
  },
  "432": {
    "backrank": "BBRNNQKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 719
  },
  "433": {
    "backrank": "BRNBNQKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ce",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 715
  },
  "434": {
    "backrank": "BRNNQBKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "cd",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 711
  },
  "435": {
    "backrank": "BRNNQKRB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "cd",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 707
  },
  "436": {
    "backrank": "RBBNNQKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 718
  },
  "437": {
    "backrank": "RNBBNQKR",
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    "family_id": "RampartGuard",
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    "family_label": "King on the wing (b/g), both knights inner",
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      "rook_files": "ah"
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  "447": {
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      "rook_files": "dh"
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    "backrank": "RBNNKQBR",
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    "backrank": "RNNBKQBR",
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      "rook_files": "ah"
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    "backrank": "BBRNNKRQ",
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      "knight_files": "de",
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  "465": {
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    "mirror_twin": 683
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    "backrank": "BRNNKBRQ",
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      "adjacent_rooks": false,
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    "mirror_twin": 679
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  "467": {
    "backrank": "BRNNKRQB",
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    "family_label": "King central (d/e), both knights inner",
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      "adjacent_rooks": false,
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      "king_band": "central",
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      "queen_file": "g",
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      "rook_files": "bf"
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    "mirror_twin": 675
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  "468": {
    "backrank": "RBBNNKRQ",
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      "adjacent_rooks": false,
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      "queen_flank": true,
      "rook_files": "ag"
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    "mirror_twin": 686
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  "469": {
    "backrank": "RNBBNKRQ",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
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      "adjacent_rooks": false,
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      "knight_files": "be",
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      "rook_files": "ag"
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    "mirror_twin": 682
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  "47": {
    "backrank": "NNQRKRBB",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
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      "adjacent_rooks": true,
      "bishop_corner": true,
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      "king_band": "central",
      "king_file": "e",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "df"
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    "mirror_twin": 912
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  "470": {
    "backrank": "RNBNKBRQ",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
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      "king_band": "central",
      "king_file": "e",
      "knight_files": "bd",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ag"
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    "mirror_twin": 678
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  "471": {
    "backrank": "RNBNKRQB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "bd",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 674
  },
  "472": {
    "backrank": "RBNNBKRQ",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "cd",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ag"
    },
    "mirror_twin": 685
  },
  "473": {
    "backrank": "RNNBBKRQ",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "bc",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ag"
    },
    "mirror_twin": 681
  },
  "474": {
    "backrank": "RNNKBBRQ",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "bc",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ag"
    },
    "mirror_twin": 677
  },
  "475": {
    "backrank": "RNNKBRQB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "bc",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 673
  },
  "476": {
    "backrank": "RBNNKRBQ",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "cd",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "af"
    },
    "mirror_twin": 684
  },
  "477": {
    "backrank": "RNNBKRBQ",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "bc",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "af"
    },
    "mirror_twin": 680
  },
  "478": {
    "backrank": "RNNKRBBQ",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "bc",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ae"
    },
    "mirror_twin": 676
  },
  "479": {
    "backrank": "RNNKRQBB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "bc",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 672
  },
  "48": {
    "backrank": "BBNNRQKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "cd",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "eh"
    },
    "mirror_twin": 911
  },
  "480": {
    "backrank": "BBQRNKNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 575
  },
  "481": {
    "backrank": "BQRBNKNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 571
  },
  "482": {
    "backrank": "BQRNKBNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 567
  },
  "483": {
    "backrank": "BQRNKNRB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "cg"
    },
    "mirror_twin": 563
  },
  "484": {
    "backrank": "QBBRNKNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "dh"
    },
    "mirror_twin": 574
  },
  "485": {
    "backrank": "QRBBNKNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bh"
    },
    "mirror_twin": 570
  },
  "486": {
    "backrank": "QRBNKBNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 3,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bh"
    },
    "mirror_twin": 566
  },
  "487": {
    "backrank": "QRBNKNRB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bg"
    },
    "mirror_twin": 562
  },
  "488": {
    "backrank": "QBRNBKNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "ch"
    },
    "mirror_twin": 573
  },
  "489": {
    "backrank": "QRNBBKNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "cg",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bh"
    },
    "mirror_twin": 569
  },
  "49": {
    "backrank": "BNNBRQKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "bc",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "eh"
    },
    "mirror_twin": 907
  },
  "490": {
    "backrank": "QRNKBBNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "cg",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bh"
    },
    "mirror_twin": 565
  },
  "491": {
    "backrank": "QRNKBNRB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 8,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bg"
    },
    "mirror_twin": 561
  },
  "492": {
    "backrank": "QBRNKNBR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "ch"
    },
    "mirror_twin": 572
  },
  "493": {
    "backrank": "QRNBKNBR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bh"
    },
    "mirror_twin": 568
  },
  "494": {
    "backrank": "QRNKNBBR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ce",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bh"
    },
    "mirror_twin": 564
  },
  "495": {
    "backrank": "QRNKNRBB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 8,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ce",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bf"
    },
    "mirror_twin": 560
  },
  "496": {
    "backrank": "BBRQNKNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 559
  },
  "497": {
    "backrank": "BRQBNKNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 555
  },
  "498": {
    "backrank": "BRQNKBNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 551
  },
  "499": {
    "backrank": "BRQNKNRB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 547
  },
  "5": {
    "backrank": "QNBBNRKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "be",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "fh"
    },
    "mirror_twin": 954
  },
  "50": {
    "backrank": "BNNRQBKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "bc",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 903
  },
  "500": {
    "backrank": "RBBQNKNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 3,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 558
  },
  "501": {
    "backrank": "RQBBNKNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 4,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 554
  },
  "502": {
    "backrank": "RQBNKBNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 2,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 550
  },
  "503": {
    "backrank": "RQBNKNRB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 546
  },
  "504": {
    "backrank": "RBQNBKNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 557
  },
  "505": {
    "backrank": "RQNBBKNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "cg",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 553
  },
  "506": {
    "backrank": "RQNKBBNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "cg",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 549
  },
  "507": {
    "backrank": "RQNKBNRB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 545
  },
  "508": {
    "backrank": "RBQNKNBR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 556
  },
  "509": {
    "backrank": "RQNBKNBR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 552
  },
  "51": {
    "backrank": "BNNRQKRB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "bc",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "dg"
    },
    "mirror_twin": 899
  },
  "510": {
    "backrank": "RQNKNBBR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ce",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 548
  },
  "511": {
    "backrank": "RQNKNRBB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ce",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 544
  },
  "512": {
    "backrank": "BBRNQKNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 543
  },
  "513": {
    "backrank": "BRNBQKNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "cg",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 539
  },
  "514": {
    "backrank": "BRNQKBNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 3,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "cg",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 535
  },
  "515": {
    "backrank": "BRNQKNRB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 531
  },
  "516": {
    "backrank": "RBBNQKNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 4,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 542
  },
  "517": {
    "backrank": "RNBBQKNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 3,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "bg",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 538
  },
  "518": {
    "backrank": "RNBQKBNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 0,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "bg",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 534
  },
  "519": {
    "backrank": "RNBQKNRB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 3,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "bf",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 530
  },
  "52": {
    "backrank": "NBBNRQKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
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      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ad",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "eh"
    },
    "mirror_twin": 910
  },
  "520": {
    "backrank": "RBNQBKNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 4,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "cg",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 541
  },
  "521": {
    "backrank": "RNQBBKNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
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      "king_band": "mid",
      "king_file": "f",
      "knight_files": "bg",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 537
  },
  "522": {
    "backrank": "RNQKBBNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 3,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "bg",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 533
  },
  "523": {
    "backrank": "RNQKBNRB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "bf",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 529
  },
  "524": {
    "backrank": "RBNQKNBR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 540
  },
  "525": {
    "backrank": "RNQBKNBR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "bf",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 536
  },
  "526": {
    "backrank": "RNQKNBBR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "be",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 532
  },
  "527": {
    "backrank": "RNQKNRBB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "be",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 528
  },
  "528": {
    "backrank": "BBRNKQNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 527
  },
  "529": {
    "backrank": "BRNBKQNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "cg",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 523
  },
  "53": {
    "backrank": "NNBBRQKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "eh"
    },
    "mirror_twin": 906
  },
  "530": {
    "backrank": "BRNKQBNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "cg",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 519
  },
  "531": {
    "backrank": "BRNKQNRB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 8,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 515
  },
  "532": {
    "backrank": "RBBNKQNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 3,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 526
  },
  "533": {
    "backrank": "RNBBKQNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 2,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "bg",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 522
  },
  "534": {
    "backrank": "RNBKQBNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 2,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "bg",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 518
  },
  "535": {
    "backrank": "RNBKQNRB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "bf",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 514
  },
  "536": {
    "backrank": "RBNKBQNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "cg",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 525
  },
  "537": {
    "backrank": "RNKBBQNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 4,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "bg",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 521
  },
  "538": {
    "backrank": "RNKQBBNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 2,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "bg",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 517
  },
  "539": {
    "backrank": "RNKQBNRB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "bf",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 513
  },
  "54": {
    "backrank": "NNBRQBKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 4,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 902
  },
  "540": {
    "backrank": "RBNKQNBR",
    "family_id": "ThroneGuard",
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      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "e",
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      "rook_files": "ah"
    },
    "mirror_twin": 524
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    "backrank": "RNKBQNBR",
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      "bishop_corner": false,
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      "king_band": "mid",
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      "knight_files": "bf",
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      "rook_files": "ah"
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    "mirror_twin": 520
  },
  "542": {
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      "bishop_corner": false,
      "bishop_files": "fg",
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      "knight_files": "be",
      "knight_placement": "central",
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      "rook_files": "ah"
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    "mirror_twin": 516
  },
  "543": {
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      "bishop_corner": true,
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      "king_band": "mid",
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      "knight_files": "be",
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      "rook_files": "af"
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    "mirror_twin": 512
  },
  "544": {
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    "family_label": "King central (d/e), both knights inner",
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      "knight_files": "df",
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      "rook_files": "ch"
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  },
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    "family_label": "King central (d/e), both knights inner",
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      "bishop_corner": true,
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      "king_band": "central",
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      "knight_files": "cf",
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      "queen_file": "g",
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      "rook_files": "bh"
    },
    "mirror_twin": 507
  },
  "546": {
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    "family_id": "ThroneGuard",
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      "bishop_corner": true,
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    },
    "mirror_twin": 503
  },
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      "queen_file": "f",
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      "rook_files": "bg"
    },
    "mirror_twin": 499
  },
  "548": {
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      "adjacent_rooks": false,
      "bishop_corner": false,
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      "king_band": "central",
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      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "g",
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      "rook_files": "ah"
    },
    "mirror_twin": 510
  },
  "549": {
    "backrank": "RNBBKNQR",
    "family_id": "ThroneGuard",
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      "bishop_corner": false,
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      "king_band": "central",
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      "knight_files": "bf",
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      "queen_file": "g",
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      "rook_files": "ah"
    },
    "mirror_twin": 506
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    "backrank": "NNBRQKRB",
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      "bishop_corner": true,
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      "king_file": "f",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "e",
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      "rook_files": "dg"
    },
    "mirror_twin": 898
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  "550": {
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    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
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      "adjacent_rooks": false,
      "bishop_corner": false,
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      "king_band": "central",
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      "knight_files": "be",
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      "rook_files": "ah"
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    "mirror_twin": 502
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      "rook_files": "ag"
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    "mirror_twin": 498
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  "552": {
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      "king_band": "central",
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    "mirror_twin": 509
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    "backrank": "NBNRBQKR",
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      "knight_files": "ac",
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      "queen_file": "f",
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      "rook_files": "dh"
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    "mirror_twin": 909
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    "backrank": "BBRNKNRQ",
    "family_id": "ThroneGuard",
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      "adjacent_rooks": false,
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    "mirror_twin": 495
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      "knight_files": "cf",
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    "mirror_twin": 491
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      "queen_file": "h",
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      "rook_files": "bg"
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    "mirror_twin": 487
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    "mirror_twin": 483
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      "bishop_corner": false,
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    "mirror_twin": 494
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  "565": {
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      "bishop_corner": false,
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    "mirror_twin": 490
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    "mirror_twin": 486
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    "mirror_twin": 482
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    "mirror_twin": 493
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      "adjacent_rooks": false,
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    "mirror_twin": 489
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  "57": {
    "backrank": "NNRBBQKR",
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      "king_band": "flank",
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      "queen_file": "f",
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      "rook_files": "ch"
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    "mirror_twin": 905
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  "570": {
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    "mirror_twin": 485
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  "571": {
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    "family_label": "King off-centre (c/f), both knights inner",
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      "adjacent_rooks": false,
      "bishop_corner": true,
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      "queen_file": "g",
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      "rook_files": "af"
    },
    "mirror_twin": 481
  },
  "572": {
    "backrank": "RBNKNRBQ",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
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      "king_band": "central",
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      "knight_files": "ce",
      "knight_placement": "central",
      "queen_file": "h",
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      "rook_files": "af"
    },
    "mirror_twin": 492
  },
  "573": {
    "backrank": "RNKBNRBQ",
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      "adjacent_rooks": false,
      "bishop_corner": false,
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      "knight_files": "be",
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      "queen_file": "h",
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      "rook_files": "af"
    },
    "mirror_twin": 488
  },
  "574": {
    "backrank": "RNKNRBBQ",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
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      "king_band": "mid",
      "king_file": "c",
      "knight_files": "bd",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ae"
    },
    "mirror_twin": 484
  },
  "575": {
    "backrank": "RNKNRQBB",
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    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
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      "king_band": "mid",
      "king_file": "c",
      "knight_files": "bd",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 480
  },
  "576": {
    "backrank": "BBQRNKRN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "dg"
    },
    "mirror_twin": 287
  },
  "577": {
    "backrank": "BQRBNKRN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "cg"
    },
    "mirror_twin": 283
  },
  "578": {
    "backrank": "BQRNKBRN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "dh",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "cg"
    },
    "mirror_twin": 279
  },
  "579": {
    "backrank": "BQRNKRNB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "cf"
    },
    "mirror_twin": 275
  },
  "58": {
    "backrank": "NNRQBBKR",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
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      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 4,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 901
  },
  "580": {
    "backrank": "QBBRNKRN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "dg"
    },
    "mirror_twin": 286
  },
  "581": {
    "backrank": "QRBBNKRN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bg"
    },
    "mirror_twin": 282
  },
  "582": {
    "backrank": "QRBNKBRN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "dh",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bg"
    },
    "mirror_twin": 278
  },
  "583": {
    "backrank": "QRBNKRNB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bf"
    },
    "mirror_twin": 274
  },
  "584": {
    "backrank": "QBRNBKRN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "dh",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "cg"
    },
    "mirror_twin": 285
  },
  "585": {
    "backrank": "QRNBBKRN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ch",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bg"
    },
    "mirror_twin": 281
  },
  "586": {
    "backrank": "QRNKBBRN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ch",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bg"
    },
    "mirror_twin": 277
  },
  "587": {
    "backrank": "QRNKBRNB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "cg",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bf"
    },
    "mirror_twin": 273
  },
  "588": {
    "backrank": "QBRNKRBN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "dh",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "cf"
    },
    "mirror_twin": 284
  },
  "589": {
    "backrank": "QRNBKRBN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "ch",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bf"
    },
    "mirror_twin": 280
  },
  "59": {
    "backrank": "NNRQBKRB",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "cg"
    },
    "mirror_twin": 897
  },
  "590": {
    "backrank": "QRNKRBBN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ch",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "be"
    },
    "mirror_twin": 276
  },
  "591": {
    "backrank": "QRNKRNBB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 8,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "be"
    },
    "mirror_twin": 272
  },
  "592": {
    "backrank": "BBRQNKRN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "cg"
    },
    "mirror_twin": 271
  },
  "593": {
    "backrank": "BRQBNKRN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 267
  },
  "594": {
    "backrank": "BRQNKBRN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "dh",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 263
  },
  "595": {
    "backrank": "BRQNKRNB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bf"
    },
    "mirror_twin": 259
  },
  "596": {
    "backrank": "RBBQNKRN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 270
  },
  "597": {
    "backrank": "RQBBNKRN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 266
  },
  "598": {
    "backrank": "RQBNKBRN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "dh",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 262
  },
  "599": {
    "backrank": "RQBNKRNB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 258
  },
  "6": {
    "backrank": "QNBNRBKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 4,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "bd",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "eh"
    },
    "mirror_twin": 950
  },
  "60": {
    "backrank": "NBNRQKBR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ac",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 908
  },
  "600": {
    "backrank": "RBQNBKRN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "dh",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 269
  },
  "601": {
    "backrank": "RQNBBKRN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ch",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 265
  },
  "602": {
    "backrank": "RQNKBBRN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ch",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 261
  },
  "603": {
    "backrank": "RQNKBRNB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "cg",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 257
  },
  "604": {
    "backrank": "RBQNKRBN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "dh",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 268
  },
  "605": {
    "backrank": "RQNBKRBN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "ch",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 264
  },
  "606": {
    "backrank": "RQNKRBBN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ch",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 260
  },
  "607": {
    "backrank": "RQNKRNBB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 256
  },
  "608": {
    "backrank": "BBRNQKRN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "dh",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "cg"
    },
    "mirror_twin": 255
  },
  "609": {
    "backrank": "BRNBQKRN",
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    "family_id": "ThroneScout",
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      "rook_files": "cf"
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  "641": {
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    "family_label": "King central (d/e), a knight on the rim (a/h)",
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  "642": {
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    "family_label": "King central (d/e), a knight on the rim (a/h)",
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    },
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    "backrank": "BRNKRQNB",
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    "family_label": "King central (d/e), both knights inner",
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      "bishop_corner": true,
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      "king_band": "central",
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      "knight_files": "cg",
      "knight_placement": "central",
      "queen_file": "f",
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      "rook_files": "be"
    },
    "mirror_twin": 211
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    "backrank": "RBBNKRQN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
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      "adjacent_rooks": false,
      "bishop_corner": false,
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      "king_band": "central",
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      "knight_files": "dh",
      "knight_placement": "rim",
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      "rook_files": "af"
    },
    "mirror_twin": 222
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    "backrank": "RNBBKRQN",
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    "family_label": "King central (d/e), a knight on the rim (a/h)",
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      "adjacent_rooks": false,
      "bishop_corner": false,
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      "king_band": "central",
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      "knight_files": "bh",
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      "queen_file": "g",
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      "rook_files": "af"
    },
    "mirror_twin": 218
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    "backrank": "RNBKRBQN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
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      "adjacent_rooks": false,
      "bishop_corner": false,
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      "king_band": "central",
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      "knight_files": "bh",
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      "queen_file": "g",
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      "rook_files": "ae"
    },
    "mirror_twin": 214
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    "backrank": "RNBKRQNB",
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    "family_label": "King central (d/e), both knights inner",
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      "adjacent_rooks": false,
      "bishop_corner": true,
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      "king_band": "central",
      "king_file": "d",
      "knight_files": "bg",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 210
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    "backrank": "RBNKBRQN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
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      "adjacent_rooks": false,
      "bishop_corner": false,
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      "king_band": "central",
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      "knight_files": "ch",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 221
  },
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    "backrank": "RNKBBRQN",
    "family_id": "BastionScout",
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      "adjacent_rooks": false,
      "bishop_corner": false,
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      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "bh",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 217
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    "backrank": "BNNBRKQR",
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    "family_label": "King off-centre (c/f), both knights inner",
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      "adjacent_rooks": false,
      "bishop_corner": true,
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      "king_band": "mid",
      "king_file": "f",
      "knight_files": "bc",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "eh"
    },
    "mirror_twin": 891
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  "650": {
    "backrank": "RNKRBBQN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "bh",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 213
  },
  "651": {
    "backrank": "RNKRBQNB",
    "family_id": "BastionGuard",
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    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
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      "king_band": "mid",
      "king_file": "c",
      "knight_files": "bg",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 209
  },
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    "backrank": "RBNKRQBN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
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      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ch",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 220
  },
  "653": {
    "backrank": "RNKBRQBN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
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      "adjacent_rooks": false,
      "bishop_corner": false,
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      "king_band": "mid",
      "king_file": "c",
      "knight_files": "bh",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 216
  },
  "654": {
    "backrank": "RNKRQBBN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
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      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "bh",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 212
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  "655": {
    "backrank": "RNKRQNBB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
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      "king_band": "mid",
      "king_file": "c",
      "knight_files": "bf",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 208
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    "backrank": "BBRNKRNQ",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
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      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
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      "king_band": "central",
      "king_file": "e",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "cf"
    },
    "mirror_twin": 207
  },
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    "backrank": "BRNBKRNQ",
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    "family_label": "King central (d/e), both knights inner",
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      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
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      "king_band": "central",
      "king_file": "e",
      "knight_files": "cg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "bf"
    },
    "mirror_twin": 203
  },
  "658": {
    "backrank": "BRNKRBNQ",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
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      "adjacent_rooks": false,
      "bishop_corner": true,
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      "king_band": "central",
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      "knight_files": "cg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "be"
    },
    "mirror_twin": 199
  },
  "659": {
    "backrank": "BRNKRNQB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
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      "adjacent_rooks": false,
      "bishop_corner": true,
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      "king_band": "central",
      "king_file": "d",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "be"
    },
    "mirror_twin": 195
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  "66": {
    "backrank": "BNNRKBQR",
    "family_id": "ThroneGuard",
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      "adjacent_rooks": false,
      "bishop_corner": true,
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      "king_band": "central",
      "king_file": "e",
      "knight_files": "bc",
      "knight_placement": "central",
      "queen_file": "g",
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      "rook_files": "dh"
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    "mirror_twin": 887
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    "backrank": "RBBNKRNQ",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
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      "king_band": "central",
      "king_file": "e",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "af"
    },
    "mirror_twin": 206
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  "661": {
    "backrank": "RNBBKRNQ",
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    "family_label": "King central (d/e), both knights inner",
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      "adjacent_rooks": false,
      "bishop_corner": false,
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      "dist_from_classic": 3,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "bg",
      "knight_placement": "central",
      "queen_file": "h",
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      "rook_files": "af"
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    "mirror_twin": 202
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  "662": {
    "backrank": "RNBKRBNQ",
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    "family_label": "King central (d/e), both knights inner",
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      "adjacent_rooks": false,
      "bishop_corner": false,
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      "king_band": "central",
      "king_file": "d",
      "knight_files": "bg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ae"
    },
    "mirror_twin": 198
  },
  "663": {
    "backrank": "RNBKRNQB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
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      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "bf",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 194
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  "664": {
    "backrank": "RBNKBRNQ",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "cg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "af"
    },
    "mirror_twin": 205
  },
  "665": {
    "backrank": "RNKBBRNQ",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
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      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "bg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "af"
    },
    "mirror_twin": 201
  },
  "666": {
    "backrank": "RNKRBBNQ",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 4,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "bg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ad"
    },
    "mirror_twin": 197
  },
  "667": {
    "backrank": "RNKRBNQB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "bf",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 193
  },
  "668": {
    "backrank": "RBNKRNBQ",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ae"
    },
    "mirror_twin": 204
  },
  "669": {
    "backrank": "RNKBRNBQ",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
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      "king_band": "mid",
      "king_file": "c",
      "knight_files": "bf",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ae"
    },
    "mirror_twin": 200
  },
  "67": {
    "backrank": "BNNRKQRB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
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      "adjacent_rooks": false,
      "bishop_corner": true,
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      "king_band": "central",
      "king_file": "e",
      "knight_files": "bc",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "dg"
    },
    "mirror_twin": 883
  },
  "670": {
    "backrank": "RNKRNBBQ",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
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      "king_band": "mid",
      "king_file": "c",
      "knight_files": "be",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ad"
    },
    "mirror_twin": 196
  },
  "671": {
    "backrank": "RNKRNQBB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "be",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 192
  },
  "672": {
    "backrank": "BBQRKNNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 479
  },
  "673": {
    "backrank": "BQRBKNNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 475
  },
  "674": {
    "backrank": "BQRKNBNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 471
  },
  "675": {
    "backrank": "BQRKNNRB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 8,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "cg"
    },
    "mirror_twin": 467
  },
  "676": {
    "backrank": "QBBRKNNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "dh"
    },
    "mirror_twin": 478
  },
  "677": {
    "backrank": "QRBBKNNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bh"
    },
    "mirror_twin": 474
  },
  "678": {
    "backrank": "QRBKNBNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bh"
    },
    "mirror_twin": 470
  },
  "679": {
    "backrank": "QRBKNNRB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bg"
    },
    "mirror_twin": 466
  },
  "68": {
    "backrank": "NBBNRKQR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ad",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "eh"
    },
    "mirror_twin": 894
  },
  "680": {
    "backrank": "QBRKBNNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "ch"
    },
    "mirror_twin": 477
  },
  "681": {
    "backrank": "QRKBBNNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bh"
    },
    "mirror_twin": 473
  },
  "682": {
    "backrank": "QRKNBBNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bh"
    },
    "mirror_twin": 469
  },
  "683": {
    "backrank": "QRKNBNRB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bg"
    },
    "mirror_twin": 465
  },
  "684": {
    "backrank": "QBRKNNBR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "ch"
    },
    "mirror_twin": 476
  },
  "685": {
    "backrank": "QRKBNNBR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bh"
    },
    "mirror_twin": 472
  },
  "686": {
    "backrank": "QRKNNBBR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bh"
    },
    "mirror_twin": 468
  },
  "687": {
    "backrank": "QRKNNRBB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bf"
    },
    "mirror_twin": 464
  },
  "688": {
    "backrank": "BBRQKNNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 463
  },
  "689": {
    "backrank": "BRQBKNNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 459
  },
  "69": {
    "backrank": "NNBBRKQR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "eh"
    },
    "mirror_twin": 890
  },
  "690": {
    "backrank": "BRQKNBNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 455
  },
  "691": {
    "backrank": "BRQKNNRB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 8,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 451
  },
  "692": {
    "backrank": "RBBQKNNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 2,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 462
  },
  "693": {
    "backrank": "RQBBKNNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 3,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 458
  },
  "694": {
    "backrank": "RQBKNBNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 3,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 454
  },
  "695": {
    "backrank": "RQBKNNRB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 450
  },
  "696": {
    "backrank": "RBQKBNNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 461
  },
  "697": {
    "backrank": "RQKBBNNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 457
  },
  "698": {
    "backrank": "RQKNBBNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 4,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 453
  },
  "699": {
    "backrank": "RQKNBNRB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 449
  },
  "7": {
    "backrank": "QNBNRKRB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "bd",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "eg"
    },
    "mirror_twin": 946
  },
  "70": {
    "backrank": "NNBRKBQR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 3,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 886
  },
  "700": {
    "backrank": "RBQKNNBR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 460
  },
  "701": {
    "backrank": "RQKBNNBR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 456
  },
  "702": {
    "backrank": "RQKNNBBR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 452
  },
  "703": {
    "backrank": "RQKNNRBB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 448
  },
  "704": {
    "backrank": "BBRKQNNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 447
  },
  "705": {
    "backrank": "BRKBQNNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 443
  },
  "706": {
    "backrank": "BRKQNBNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 4,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 439
  },
  "707": {
    "backrank": "BRKQNNRB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 435
  },
  "708": {
    "backrank": "RBBKQNNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 446
  },
  "709": {
    "backrank": "RKBBQNNR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 4,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 442
  },
  "71": {
    "backrank": "NNBRKQRB",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "dg"
    },
    "mirror_twin": 882
  },
  "710": {
    "backrank": "RKBQNBNR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 2,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 438
  },
  "711": {
    "backrank": "RKBQNNRB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 434
  },
  "712": {
    "backrank": "RBKQBNNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 4,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 445
  },
  "713": {
    "backrank": "RKQBBNNR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 441
  },
  "714": {
    "backrank": "RKQNBBNR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 4,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 437
  },
  "715": {
    "backrank": "RKQNBNRB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 433
  },
  "716": {
    "backrank": "RBKQNNBR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 444
  },
  "717": {
    "backrank": "RKQBNNBR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 440
  },
  "718": {
    "backrank": "RKQNNBBR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 436
  },
  "719": {
    "backrank": "RKQNNRBB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 432
  },
  "72": {
    "backrank": "NBNRBKQR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ac",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 893
  },
  "720": {
    "backrank": "BBRKNQNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 431
  },
  "721": {
    "backrank": "BRKBNQNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 427
  },
  "722": {
    "backrank": "BRKNQBNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 423
  },
  "723": {
    "backrank": "BRKNQNRB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 419
  },
  "724": {
    "backrank": "RBBKNQNR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 430
  },
  "725": {
    "backrank": "RKBBNQNR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 4,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 426
  },
  "726": {
    "backrank": "RKBNQBNR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 3,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 422
  },
  "727": {
    "backrank": "RKBNQNRB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 418
  },
  "728": {
    "backrank": "RBKNBQNR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 429
  },
  "729": {
    "backrank": "RKNBBQNR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "cg",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 425
  },
  "73": {
    "backrank": "NNRBBKQR",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 889
  },
  "730": {
    "backrank": "RKNQBBNR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 3,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "cg",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 421
  },
  "731": {
    "backrank": "RKNQBNRB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 417
  },
  "732": {
    "backrank": "RBKNQNBR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 428
  },
  "733": {
    "backrank": "RKNBQNBR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 424
  },
  "734": {
    "backrank": "RKNQNBBR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 4,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "ce",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 420
  },
  "735": {
    "backrank": "RKNQNRBB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "ce",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 416
  },
  "736": {
    "backrank": "BBRKNNQR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 415
  },
  "737": {
    "backrank": "BRKBNNQR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 411
  },
  "738": {
    "backrank": "BRKNNBQR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "bh"
    },
    "mirror_twin": 407
  },
  "739": {
    "backrank": "BRKNNQRB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 403
  },
  "74": {
    "backrank": "NNRKBBQR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 885
  },
  "740": {
    "backrank": "RBBKNNQR",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 414
  },
  "741": {
    "backrank": "RKBBNNQR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 410
  },
  "742": {
    "backrank": "RKBNNBQR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 4,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 406
  },
  "743": {
    "backrank": "RKBNNQRB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 402
  },
  "744": {
    "backrank": "RBKNBNQR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 413
  },
  "745": {
    "backrank": "RKNBBNQR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 409
  },
  "746": {
    "backrank": "RKNNBBQR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "cd",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 405
  },
  "747": {
    "backrank": "RKNNBQRB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "cd",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 401
  },
  "748": {
    "backrank": "RBKNNQBR",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 412
  },
  "749": {
    "backrank": "RKNBNQBR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "ce",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 408
  },
  "75": {
    "backrank": "NNRKBQRB",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "cg"
    },
    "mirror_twin": 881
  },
  "750": {
    "backrank": "RKNNQBBR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "cd",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ah"
    },
    "mirror_twin": 404
  },
  "751": {
    "backrank": "RKNNQRBB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "cd",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 400
  },
  "752": {
    "backrank": "BBRKNNRQ",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 8,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "cg"
    },
    "mirror_twin": 399
  },
  "753": {
    "backrank": "BRKBNNRQ",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "bg"
    },
    "mirror_twin": 395
  },
  "754": {
    "backrank": "BRKNNBRQ",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "bg"
    },
    "mirror_twin": 391
  },
  "755": {
    "backrank": "BRKNNRQB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "bf"
    },
    "mirror_twin": 387
  },
  "756": {
    "backrank": "RBBKNNRQ",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ag"
    },
    "mirror_twin": 398
  },
  "757": {
    "backrank": "RKBBNNRQ",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ag"
    },
    "mirror_twin": 394
  },
  "758": {
    "backrank": "RKBNNBRQ",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ag"
    },
    "mirror_twin": 390
  },
  "759": {
    "backrank": "RKBNNRQB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 386
  },
  "76": {
    "backrank": "NBNRKQBR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "ac",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 892
  },
  "760": {
    "backrank": "RBKNBNRQ",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ag"
    },
    "mirror_twin": 397
  },
  "761": {
    "backrank": "RKNBBNRQ",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ag"
    },
    "mirror_twin": 393
  },
  "762": {
    "backrank": "RKNNBBRQ",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "cd",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ag"
    },
    "mirror_twin": 389
  },
  "763": {
    "backrank": "RKNNBRQB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "cd",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 385
  },
  "764": {
    "backrank": "RBKNNRBQ",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "af"
    },
    "mirror_twin": 396
  },
  "765": {
    "backrank": "RKNBNRBQ",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "ce",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "af"
    },
    "mirror_twin": 392
  },
  "766": {
    "backrank": "RKNNRBBQ",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "cd",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ae"
    },
    "mirror_twin": 388
  },
  "767": {
    "backrank": "RKNNRQBB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "cd",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 384
  },
  "768": {
    "backrank": "BBQRKNRN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "dg"
    },
    "mirror_twin": 191
  },
  "769": {
    "backrank": "BQRBKNRN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "cg"
    },
    "mirror_twin": 187
  },
  "77": {
    "backrank": "NNRBKQBR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 888
  },
  "770": {
    "backrank": "BQRKNBRN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "cg"
    },
    "mirror_twin": 183
  },
  "771": {
    "backrank": "BQRKNRNB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "cf"
    },
    "mirror_twin": 179
  },
  "772": {
    "backrank": "QBBRKNRN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "dg"
    },
    "mirror_twin": 190
  },
  "773": {
    "backrank": "QRBBKNRN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bg"
    },
    "mirror_twin": 186
  },
  "774": {
    "backrank": "QRBKNBRN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bg"
    },
    "mirror_twin": 182
  },
  "775": {
    "backrank": "QRBKNRNB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bf"
    },
    "mirror_twin": 178
  },
  "776": {
    "backrank": "QBRKBNRN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 8,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "cg"
    },
    "mirror_twin": 189
  },
  "777": {
    "backrank": "QRKBBNRN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bg"
    },
    "mirror_twin": 185
  },
  "778": {
    "backrank": "QRKNBBRN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "dh",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bg"
    },
    "mirror_twin": 181
  },
  "779": {
    "backrank": "QRKNBRNB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bf"
    },
    "mirror_twin": 177
  },
  "78": {
    "backrank": "NNRKQBBR",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ch"
    },
    "mirror_twin": 884
  },
  "780": {
    "backrank": "QBRKNRBN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 8,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "cf"
    },
    "mirror_twin": 188
  },
  "781": {
    "backrank": "QRKBNRBN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
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      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bf"
    },
    "mirror_twin": 184
  },
  "782": {
    "backrank": "QRKNRBBN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "dh",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "be"
    },
    "mirror_twin": 180
  },
  "783": {
    "backrank": "QRKNRNBB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "be"
    },
    "mirror_twin": 176
  },
  "784": {
    "backrank": "BBRQKNRN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "cg"
    },
    "mirror_twin": 175
  },
  "785": {
    "backrank": "BRQBKNRN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 171
  },
  "786": {
    "backrank": "BRQKNBRN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 167
  },
  "787": {
    "backrank": "BRQKNRNB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bf"
    },
    "mirror_twin": 163
  },
  "788": {
    "backrank": "RBBQKNRN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 174
  },
  "789": {
    "backrank": "RQBBKNRN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 170
  },
  "79": {
    "backrank": "NNRKQRBB",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "cf"
    },
    "mirror_twin": 880
  },
  "790": {
    "backrank": "RQBKNBRN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 166
  },
  "791": {
    "backrank": "RQBKNRNB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 162
  },
  "792": {
    "backrank": "RBQKBNRN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 173
  },
  "793": {
    "backrank": "RQKBBNRN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 169
  },
  "794": {
    "backrank": "RQKNBBRN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "dh",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 165
  },
  "795": {
    "backrank": "RQKNBRNB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 161
  },
  "796": {
    "backrank": "RBQKNRBN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 172
  },
  "797": {
    "backrank": "RQKBNRBN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
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      "king_band": "mid",
      "king_file": "c",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 168
  },
  "798": {
    "backrank": "RQKNRBBN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "dh",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 164
  },
  "799": {
    "backrank": "RQKNRNBB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 160
  },
  "8": {
    "backrank": "QBNNBRKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "cd",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "fh"
    },
    "mirror_twin": 957
  },
  "80": {
    "backrank": "BBNNRKRQ",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "cd",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "eg"
    },
    "mirror_twin": 879
  },
  "800": {
    "backrank": "BBRKQNRN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 8,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "cg"
    },
    "mirror_twin": 159
  },
  "801": {
    "backrank": "BRKBQNRN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 155
  },
  "802": {
    "backrank": "BRKQNBRN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 151
  },
  "803": {
    "backrank": "BRKQNRNB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "bf"
    },
    "mirror_twin": 147
  },
  "804": {
    "backrank": "RBBKQNRN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 158
  },
  "805": {
    "backrank": "RKBBQNRN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 154
  },
  "806": {
    "backrank": "RKBQNBRN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 4,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 150
  },
  "807": {
    "backrank": "RKBQNRNB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 4,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 146
  },
  "808": {
    "backrank": "RBKQBNRN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 157
  },
  "809": {
    "backrank": "RKQBBNRN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 153
  },
  "81": {
    "backrank": "BNNBRKRQ",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "bc",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "eg"
    },
    "mirror_twin": 875
  },
  "810": {
    "backrank": "RKQNBBRN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "dh",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 149
  },
  "811": {
    "backrank": "RKQNBRNB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 145
  },
  "812": {
    "backrank": "RBKQNRBN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 156
  },
  "813": {
    "backrank": "RKQBNRBN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 152
  },
  "814": {
    "backrank": "RKQNRBBN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "dh",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 148
  },
  "815": {
    "backrank": "RKQNRNBB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 144
  },
  "816": {
    "backrank": "BBRKNQRN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 8,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "cg"
    },
    "mirror_twin": 143
  },
  "817": {
    "backrank": "BRKBNQRN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 139
  },
  "818": {
    "backrank": "BRKNQBRN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "dh",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "bg"
    },
    "mirror_twin": 135
  },
  "819": {
    "backrank": "BRKNQRNB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "bf"
    },
    "mirror_twin": 131
  },
  "82": {
    "backrank": "BNNRKBRQ",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "bc",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "dg"
    },
    "mirror_twin": 871
  },
  "820": {
    "backrank": "RBBKNQRN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 142
  },
  "821": {
    "backrank": "RKBBNQRN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 138
  },
  "822": {
    "backrank": "RKBNQBRN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "dh",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 134
  },
  "823": {
    "backrank": "RKBNQRNB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 130
  },
  "824": {
    "backrank": "RBKNBQRN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "dh",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 141
  },
  "825": {
    "backrank": "RKNBBQRN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "ch",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 137
  },
  "826": {
    "backrank": "RKNQBBRN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "ch",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ag"
    },
    "mirror_twin": 133
  },
  "827": {
    "backrank": "RKNQBRNB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "cg",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 129
  },
  "828": {
    "backrank": "RBKNQRBN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "dh",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 140
  },
  "829": {
    "backrank": "RKNBQRBN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "ch",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 136
  },
  "83": {
    "backrank": "BNNRKRQB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "bc",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "df"
    },
    "mirror_twin": 867
  },
  "830": {
    "backrank": "RKNQRBBN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "ch",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 132
  },
  "831": {
    "backrank": "RKNQRNBB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 128
  },
  "832": {
    "backrank": "BBRKNRQN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 8,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "cf"
    },
    "mirror_twin": 127
  },
  "833": {
    "backrank": "BRKBNRQN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "bf"
    },
    "mirror_twin": 123
  },
  "834": {
    "backrank": "BRKNRBQN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "dh",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "be"
    },
    "mirror_twin": 119
  },
  "835": {
    "backrank": "BRKNRQNB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "be"
    },
    "mirror_twin": 115
  },
  "836": {
    "backrank": "RBBKNRQN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 126
  },
  "837": {
    "backrank": "RKBBNRQN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 122
  },
  "838": {
    "backrank": "RKBNRBQN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "dh",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 118
  },
  "839": {
    "backrank": "RKBNRQNB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 114
  },
  "84": {
    "backrank": "NBBNRKRQ",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ad",
      "knight_placement": "rim",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "eg"
    },
    "mirror_twin": 878
  },
  "840": {
    "backrank": "RBKNBRQN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "dh",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 125
  },
  "841": {
    "backrank": "RKNBBRQN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "ch",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 121
  },
  "842": {
    "backrank": "RKNRBBQN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "ch",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 117
  },
  "843": {
    "backrank": "RKNRBQNB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "cg",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 113
  },
  "844": {
    "backrank": "RBKNRQBN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "dh",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 124
  },
  "845": {
    "backrank": "RKNBRQBN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "ch",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 120
  },
  "846": {
    "backrank": "RKNRQBBN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "ch",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 116
  },
  "847": {
    "backrank": "RKNRQNBB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 112
  },
  "848": {
    "backrank": "BBRKNRNQ",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "cf"
    },
    "mirror_twin": 111
  },
  "849": {
    "backrank": "BRKBNRNQ",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "bf"
    },
    "mirror_twin": 107
  },
  "85": {
    "backrank": "NNBBRKRQ",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "eg"
    },
    "mirror_twin": 874
  },
  "850": {
    "backrank": "BRKNRBNQ",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "be"
    },
    "mirror_twin": 103
  },
  "851": {
    "backrank": "BRKNRNQB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "be"
    },
    "mirror_twin": 99
  },
  "852": {
    "backrank": "RBBKNRNQ",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "af"
    },
    "mirror_twin": 110
  },
  "853": {
    "backrank": "RKBBNRNQ",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "af"
    },
    "mirror_twin": 106
  },
  "854": {
    "backrank": "RKBNRBNQ",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 4,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ae"
    },
    "mirror_twin": 102
  },
  "855": {
    "backrank": "RKBNRNQB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 98
  },
  "856": {
    "backrank": "RBKNBRNQ",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "af"
    },
    "mirror_twin": 109
  },
  "857": {
    "backrank": "RKNBBRNQ",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "cg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "af"
    },
    "mirror_twin": 105
  },
  "858": {
    "backrank": "RKNRBBNQ",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "cg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ad"
    },
    "mirror_twin": 101
  },
  "859": {
    "backrank": "RKNRBNQB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 97
  },
  "86": {
    "backrank": "NNBRKBRQ",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "dg"
    },
    "mirror_twin": 870
  },
  "860": {
    "backrank": "RBKNRNBQ",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ae"
    },
    "mirror_twin": 108
  },
  "861": {
    "backrank": "RKNBRNBQ",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ae"
    },
    "mirror_twin": 104
  },
  "862": {
    "backrank": "RKNRNBBQ",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "ce",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ad"
    },
    "mirror_twin": 100
  },
  "863": {
    "backrank": "RKNRNQBB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "ce",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 96
  },
  "864": {
    "backrank": "BBQRKRNN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "df"
    },
    "mirror_twin": 95
  },
  "865": {
    "backrank": "BQRBKRNN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "cf"
    },
    "mirror_twin": 91
  },
  "866": {
    "backrank": "BQRKRBNN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ce"
    },
    "mirror_twin": 87
  },
  "867": {
    "backrank": "BQRKRNNB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ce"
    },
    "mirror_twin": 83
  },
  "868": {
    "backrank": "QBBRKRNN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "df"
    },
    "mirror_twin": 94
  },
  "869": {
    "backrank": "QRBBKRNN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bf"
    },
    "mirror_twin": 90
  },
  "87": {
    "backrank": "NNBRKRQB",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "df"
    },
    "mirror_twin": 866
  },
  "870": {
    "backrank": "QRBKRBNN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "be"
    },
    "mirror_twin": 86
  },
  "871": {
    "backrank": "QRBKRNNB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "be"
    },
    "mirror_twin": 82
  },
  "872": {
    "backrank": "QBRKBRNN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "cf"
    },
    "mirror_twin": 93
  },
  "873": {
    "backrank": "QRKBBRNN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bf"
    },
    "mirror_twin": 89
  },
  "874": {
    "backrank": "QRKRBBNN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bd"
    },
    "mirror_twin": 85
  },
  "875": {
    "backrank": "QRKRBNNB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bd"
    },
    "mirror_twin": 81
  },
  "876": {
    "backrank": "QBRKRNBN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 8,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "ce"
    },
    "mirror_twin": 92
  },
  "877": {
    "backrank": "QRKBRNBN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "be"
    },
    "mirror_twin": 88
  },
  "878": {
    "backrank": "QRKRNBBN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bd"
    },
    "mirror_twin": 84
  },
  "879": {
    "backrank": "QRKRNNBB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "bd"
    },
    "mirror_twin": 80
  },
  "88": {
    "backrank": "NBNRBKRQ",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ac",
      "knight_placement": "rim",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "dg"
    },
    "mirror_twin": 877
  },
  "880": {
    "backrank": "BBRQKRNN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "cf"
    },
    "mirror_twin": 79
  },
  "881": {
    "backrank": "BRQBKRNN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "bf"
    },
    "mirror_twin": 75
  },
  "882": {
    "backrank": "BRQKRBNN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "be"
    },
    "mirror_twin": 71
  },
  "883": {
    "backrank": "BRQKRNNB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "be"
    },
    "mirror_twin": 67
  },
  "884": {
    "backrank": "RBBQKRNN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 3,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 78
  },
  "885": {
    "backrank": "RQBBKRNN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 74
  },
  "886": {
    "backrank": "RQBKRBNN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 4,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 70
  },
  "887": {
    "backrank": "RQBKRNNB",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 66
  },
  "888": {
    "backrank": "RBQKBRNN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 77
  },
  "889": {
    "backrank": "RQKBBRNN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 73
  },
  "89": {
    "backrank": "NNRBBKRQ",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "cg"
    },
    "mirror_twin": 873
  },
  "890": {
    "backrank": "RQKRBBNN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 69
  },
  "891": {
    "backrank": "RQKRBNNB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 65
  },
  "892": {
    "backrank": "RBQKRNBN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 76
  },
  "893": {
    "backrank": "RQKBRNBN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 72
  },
  "894": {
    "backrank": "RQKRNBBN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 68
  },
  "895": {
    "backrank": "RQKRNNBB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 64
  },
  "896": {
    "backrank": "BBRKQRNN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "cf"
    },
    "mirror_twin": 63
  },
  "897": {
    "backrank": "BRKBQRNN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "bf"
    },
    "mirror_twin": 59
  },
  "898": {
    "backrank": "BRKQRBNN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "be"
    },
    "mirror_twin": 55
  },
  "899": {
    "backrank": "BRKQRNNB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "be"
    },
    "mirror_twin": 51
  },
  "9": {
    "backrank": "QNNBBRKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "bc",
      "knight_placement": "central",
      "queen_file": "a",
      "queen_flank": true,
      "rook_files": "fh"
    },
    "mirror_twin": 953
  },
  "90": {
    "backrank": "NNRKBBRQ",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "cg"
    },
    "mirror_twin": 869
  },
  "900": {
    "backrank": "RBBKQRNN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 62
  },
  "901": {
    "backrank": "RKBBQRNN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 58
  },
  "902": {
    "backrank": "RKBQRBNN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 3,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 54
  },
  "903": {
    "backrank": "RKBQRNNB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 4,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 50
  },
  "904": {
    "backrank": "RBKQBRNN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 5,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 61
  },
  "905": {
    "backrank": "RKQBBRNN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "af"
    },
    "mirror_twin": 57
  },
  "906": {
    "backrank": "RKQRBBNN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 53
  },
  "907": {
    "backrank": "RKQRBNNB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 49
  },
  "908": {
    "backrank": "RBKQRNBN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 60
  },
  "909": {
    "backrank": "RKQBRNBN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 56
  },
  "91": {
    "backrank": "NNRKBRQB",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "cf"
    },
    "mirror_twin": 865
  },
  "910": {
    "backrank": "RKQRNBBN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 52
  },
  "911": {
    "backrank": "RKQRNNBB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 48
  },
  "912": {
    "backrank": "BBRKRQNN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ce"
    },
    "mirror_twin": 47
  },
  "913": {
    "backrank": "BRKBRQNN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "be"
    },
    "mirror_twin": 43
  },
  "914": {
    "backrank": "BRKRQBNN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "bd"
    },
    "mirror_twin": 39
  },
  "915": {
    "backrank": "BRKRQNNB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "bd"
    },
    "mirror_twin": 35
  },
  "916": {
    "backrank": "RBBKRQNN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 46
  },
  "917": {
    "backrank": "RKBBRQNN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 42
  },
  "918": {
    "backrank": "RKBRQBNN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 4,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 38
  },
  "919": {
    "backrank": "RKBRQNNB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 34
  },
  "92": {
    "backrank": "NBNRKRBQ",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "ac",
      "knight_placement": "rim",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "df"
    },
    "mirror_twin": 876
  },
  "920": {
    "backrank": "RBKRBQNN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 45
  },
  "921": {
    "backrank": "RKRBBQNN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ac"
    },
    "mirror_twin": 41
  },
  "922": {
    "backrank": "RKRQBBNN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 4,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "gh",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ac"
    },
    "mirror_twin": 37
  },
  "923": {
    "backrank": "RKRQBNNB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ac"
    },
    "mirror_twin": 33
  },
  "924": {
    "backrank": "RBKRQNBN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 44
  },
  "925": {
    "backrank": "RKRBQNBN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ac"
    },
    "mirror_twin": 40
  },
  "926": {
    "backrank": "RKRQNBBN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ac"
    },
    "mirror_twin": 36
  },
  "927": {
    "backrank": "RKRQNNBB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "d",
      "queen_flank": false,
      "rook_files": "ac"
    },
    "mirror_twin": 32
  },
  "928": {
    "backrank": "BBRKRNQN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 8,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ce"
    },
    "mirror_twin": 31
  },
  "929": {
    "backrank": "BRKBRNQN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "be"
    },
    "mirror_twin": 27
  },
  "93": {
    "backrank": "NNRBKRBQ",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "e",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "cf"
    },
    "mirror_twin": 872
  },
  "930": {
    "backrank": "BRKRNBQN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "bd"
    },
    "mirror_twin": 23
  },
  "931": {
    "backrank": "BRKRNQNB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "bd"
    },
    "mirror_twin": 19
  },
  "932": {
    "backrank": "RBBKRNQN",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 30
  },
  "933": {
    "backrank": "RKBBRNQN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ae"
    },
    "mirror_twin": 26
  },
  "934": {
    "backrank": "RKBRNBQN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 22
  },
  "935": {
    "backrank": "RKBRNQNB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 18
  },
  "936": {
    "backrank": "RBKRBNQN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 29
  },
  "937": {
    "backrank": "RKRBBNQN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "fh",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ac"
    },
    "mirror_twin": 25
  },
  "938": {
    "backrank": "RKRNBBQN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "dh",
      "knight_placement": "rim",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ac"
    },
    "mirror_twin": 21
  },
  "939": {
    "backrank": "RKRNBQNB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ac"
    },
    "mirror_twin": 17
  },
  "94": {
    "backrank": "NNRKRBBQ",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 6,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ce"
    },
    "mirror_twin": 868
  },
  "940": {
    "backrank": "RBKRNQBN",
    "family_id": "BastionScout",
    "family_label": "King off-centre (c/f), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 28
  },
  "941": {
    "backrank": "RKRBNQBN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "eh",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ac"
    },
    "mirror_twin": 24
  },
  "942": {
    "backrank": "RKRNQBBN",
    "family_id": "RampartScout",
    "family_label": "King on the wing (b/g), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "dh",
      "knight_placement": "rim",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ac"
    },
    "mirror_twin": 20
  },
  "943": {
    "backrank": "RKRNQNBB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "e",
      "queen_flank": false,
      "rook_files": "ac"
    },
    "mirror_twin": 16
  },
  "944": {
    "backrank": "BBRKRNNQ",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ce"
    },
    "mirror_twin": 15
  },
  "945": {
    "backrank": "BRKBRNNQ",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "be"
    },
    "mirror_twin": 11
  },
  "946": {
    "backrank": "BRKRNBNQ",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "bd"
    },
    "mirror_twin": 7
  },
  "947": {
    "backrank": "BRKRNNQB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "bd"
    },
    "mirror_twin": 3
  },
  "948": {
    "backrank": "RBBKRNNQ",
    "family_id": "ThroneGuard",
    "family_label": "King central (d/e), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bc",
      "dist_from_classic": 5,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ae"
    },
    "mirror_twin": 14
  },
  "949": {
    "backrank": "RKBBRNNQ",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cd",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ae"
    },
    "mirror_twin": 10
  },
  "95": {
    "backrank": "NNRKRQBB",
    "family_id": "ThroneScout",
    "family_label": "King central (d/e), a knight on the rim (a/h)",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 7,
      "king_band": "central",
      "king_file": "d",
      "knight_files": "ab",
      "knight_placement": "rim",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ce"
    },
    "mirror_twin": 864
  },
  "950": {
    "backrank": "RKBRNBNQ",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "cf",
      "dist_from_classic": 4,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "eg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ad"
    },
    "mirror_twin": 6
  },
  "951": {
    "backrank": "RKBRNNQB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ch",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ad"
    },
    "mirror_twin": 2
  },
  "952": {
    "backrank": "RBKRBNNQ",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "be",
      "dist_from_classic": 6,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ad"
    },
    "mirror_twin": 13
  },
  "953": {
    "backrank": "RKRBBNNQ",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "de",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "fg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ac"
    },
    "mirror_twin": 9
  },
  "954": {
    "backrank": "RKRNBBNQ",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "ef",
      "dist_from_classic": 5,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "dg",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ac"
    },
    "mirror_twin": 5
  },
  "955": {
    "backrank": "RKRNBNQB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "eh",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "g",
      "queen_flank": false,
      "rook_files": "ac"
    },
    "mirror_twin": 1
  },
  "956": {
    "backrank": "RBKRNNBQ",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": false,
      "bishop_files": "bg",
      "dist_from_classic": 7,
      "king_band": "mid",
      "king_file": "c",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ad"
    },
    "mirror_twin": 12
  },
  "957": {
    "backrank": "RKRBNNBQ",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "dg",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "ef",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ac"
    },
    "mirror_twin": 8
  },
  "958": {
    "backrank": "RKRNNBBQ",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": false,
      "bishop_files": "fg",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "h",
      "queen_flank": true,
      "rook_files": "ac"
    },
    "mirror_twin": 4
  },
  "959": {
    "backrank": "RKRNNQBB",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": true,
      "bishop_corner": true,
      "bishop_files": "gh",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "b",
      "knight_files": "de",
      "knight_placement": "central",
      "queen_file": "f",
      "queen_flank": false,
      "rook_files": "ac"
    },
    "mirror_twin": 0
  },
  "96": {
    "backrank": "BBQNRNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ab",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "df",
      "knight_placement": "central",
      "queen_file": "c",
      "queen_flank": false,
      "rook_files": "eh"
    },
    "mirror_twin": 863
  },
  "97": {
    "backrank": "BQNBRNKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ad",
      "dist_from_classic": 7,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "cf",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "eh"
    },
    "mirror_twin": 859
  },
  "98": {
    "backrank": "BQNRNBKR",
    "family_id": "RampartGuard",
    "family_label": "King on the wing (b/g), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "af",
      "dist_from_classic": 6,
      "king_band": "flank",
      "king_file": "g",
      "knight_files": "ce",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "dh"
    },
    "mirror_twin": 855
  },
  "99": {
    "backrank": "BQNRNKRB",
    "family_id": "BastionGuard",
    "family_label": "King off-centre (c/f), both knights inner",
    "invariants": {
      "adjacent_rooks": false,
      "bishop_corner": true,
      "bishop_files": "ah",
      "dist_from_classic": 8,
      "king_band": "mid",
      "king_file": "f",
      "knight_files": "ce",
      "knight_placement": "central",
      "queen_file": "b",
      "queen_flank": false,
      "rook_files": "dg"
    },
    "mirror_twin": 851
  }
}