Starting position #712
Back-rank setup: RBKQBNNR
SP-712 · BastionGuard — Both knights begin inside the board while the king stands on c or f; a position and its mirror twin share this family.
Move the pieces right on the board — full Chess960 rules, castle by dropping the king on the rook.
Position features
The king starts on c1, the rooks on a1 and h1, the queen on d1.
The king already stands on c1, so castling long moves only the rook, from a1 to d1.
The bishops stand on b1 and e1; their long diagonals reach h7 and a5 once the c- and d-pawns step aside.
One second-rank pawn starts with no defender at all: g2.
The setup belongs to the BastionGuard family; read right to left it becomes position 445.
The engine's main line opens with c4.
Every sentence here is computed from the setup itself and can be checked on the board.
Balance
MBI 37 Morozov Balance Index: 37 of 100 — class C — noticeable edge.
- Engine evaluation of the starting position: +30 centipawns for White (depth 45, 400 000 000 nodes).
- Rank 598 of 960 by balance — 1 is the most balanced start.
- Balance band M — moderate edge · dynamics along the play-out: equalizing
- Evaluation along the engine's main line (43 half-moves): +58 → +20 → 0
Position facts
- Mirror twin: position #445
- The king starts on c, the rooks on a and h
- It becomes the daily position in 226 days
Puzzles from this position
- Attack on the uncastled king: bishop to e4 (b1·11) — Chess960 specifics · 780
- Attack on the uncastled king: bishop to e4 (b1·16) — Chess960 specifics · 780
- Attack on the uncastled king: bishop to g7 (c3·2) — Chess960 specifics · 920
- Winning blow: king to a2 (a3·2) — Chess960 specifics · 970
- Winning blow: queen to a3 (c5) — Chess960 specifics · 1110
- Attack on the uncastled king: bishop to b3 (c2·4) — Chess960 specifics · 1200
- Winning blow: rook to d8 (d3·5) — Chess960 specifics · 1290
- Winning blow: knight to c6 (e5·23) — Chess960 specifics · 1420
- Mate in 3: rook to c3 (a3) — Chess960 specifics · 1630
- Mate in 3: rook to a6 (b6) — Chess960 specifics · 2210
This position appears in course day 144
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Commentary
The king already stands on c1, so long castling moves the rook alone from a1. The bishops are on b1 and e1, the knights side by side on f1 and g1. Among the pawns, g2 has no defender, and b2 leans on the king alone. The queen is on d1 beside her king, the second rook in the corner on h1. The main line of the run opens c4 e5, then d4 exd4 Qxd4 Ne6.
Written from the measured facts above and checked against the board before publishing. All 960 positions have one.