Starting position #732
Back-rank setup: RBKNQNBR
SP-732 · BastionGuard — King off-centre on c or f with both knights on inner files.
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 e1.
The king already stands on c1, so castling long moves only the rook, from a1 to d1.
The bishops stand on b1 and g1; their long diagonals reach h7 and a7 once the c- and f-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 428.
The engine's main line opens with d4, 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 24 Morozov Balance Index: 24 of 100 — class D — largest edge.
- Engine evaluation of the starting position: +35 centipawns for White (depth 46, 400 000 000 nodes).
- Rank 723 of 960 by balance — 1 is the most balanced start.
- Balance band M — moderate edge · dynamics along the play-out: sharpening
- Evaluation along the engine's main line (60 half-moves): +44 → +33 → +64 → +38
Position facts
- Mirror twin: position #428
- The king starts on c, the rooks on a and h
- It becomes the daily position in 572 days
Puzzles from this position
- Attack on the uncastled king: knight to e7 (f5·2) — Chess960 specifics · 620
- Attack on the uncastled king: queen to h8 (g7·2) — Chess960 specifics · 780
- Attack on the uncastled king: knight to c2 (e3) — Chess960 specifics · 920
- Winning blow: queen to b8 (g3·2) — Chess960 specifics · 970
- Winning blow: pawn to c5 (b4·12) — Chess960 specifics · 1200
- Mate in 2: queen to b5 (b4·3) — Chess960 specifics · 1320
- Winning blow: queen to c6 (c4·5) — Chess960 specifics · 1510
- Mate in 3: queen to c6 (c2·2) — Chess960 specifics · 1760
- Winning blow: queen to a8 (d8·4) — Chess960 specifics · 1870
- Chess960 tactic on e6 (e3) — Chess960 specifics · 2120
This position appears in course day 4
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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 g1, the knights on d1 and f1. Among the pawns, g2 is the one that begins without a defender. The queen is on e1, the second rook in the corner on h1. The engine takes the centre with d4 and both sides mirror: d4 d5 c3 c6 f3 f6.
Written from the measured facts above and checked against the board before publishing. All 960 positions have one.