Starting position #100
Back-rank setup: QBBNRNKR
SP-100 · RampartGuard — Both knights begin on inner files while the king sits on the wing (b/g); mirror twins stay together in 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 g1, the rooks on e1 and h1, the queen on a1.
The king already stands on its castled square, so castling short moves only the rook, from h1 to f1.
The bishops stand on b1 and c1; their long diagonals reach h7 and h6 once the c- and d-pawns step aside.
The pawn on g2 is defended by the king alone — the same soft spot f2 is in the classical setup.
The setup belongs to the RampartGuard family; read right to left it becomes position 862.
The engine's main line opens with e4, putting a pawn straight into the centre.
Every sentence here is computed from the setup itself and can be checked on the board.
Balance
MBI 11 Morozov Balance Index: 11 of 100 — class D — largest edge.
- Engine evaluation of the starting position: +42 centipawns for White (depth 46, 400 000 000 nodes).
- Rank 859 of 960 by balance — 1 is the most balanced start.
- Balance band L — large edge · dynamics along the play-out: equalizing
- Evaluation along the engine's main line (60 half-moves): +47 → +30 → 0
Position facts
- Mirror twin: position #862
- The king starts on g, the rooks on e and h
- King and rook are neighbours — castling from adjacent squares feels unusual
- It becomes the daily position in 70 days
Puzzles from this position
- Attack on the uncastled king: bishop to a1 (b2) — Chess960 specifics · 780
- Winning blow: knight to e2 (g3) — Chess960 specifics · 920
- Winning blow: pawn to f4 (f3·3) — Chess960 specifics · 970
- Winning blow: bishop to c7 (g3·4) — Chess960 specifics · 1200
- Winning blow: bishop to g5 (c1·5) — Chess960 specifics · 1250
- Winning blow: rook to g8 (g3·2) — Chess960 specifics · 1290
- Attack on the uncastled king: bishop to b2 (c1·10) — Chess960 specifics · 1340
- Attack on the uncastled king: queen to g7 (c3·8) — Chess960 specifics · 1450
- Winning blow: queen to g7 (b2·3) — Chess960 specifics · 1700
- Chess960 tactic on f2 (g1) — Chess960 specifics · 2120
This position appears in course day 91
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Commentary
The queen begins in the corner on a1, with both bishops next to her on b1 and c1. The king is already on g1, so short castling moves only the rook, from h1 to f1. The knights start on d1 and f1, which gives the f1 knight e3 and g3 to choose from. Among the pawns, g2 is defended by the king alone. The main line of the run opens e4 e5, then b4 c6 d4 exd4.
Written from the measured facts above and checked against the board before publishing. All 960 positions have one.