Starting position #893
Back-rank setup: RQKBRNBN
SP-893 · BastionScout — King shifted to c or f, with a knight committed to the corner from move one.
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 e1, the queen on b1.
The king already stands on c1, so castling long moves only the rook, from a1 to d1.
The bishops stand on d1 and g1; their long diagonals reach h5 and a7 once the e- and f-pawns step aside.
One second-rank pawn starts with no defender at all: g2.
The setup belongs to the BastionScout family; read right to left it becomes position 72.
The engine's main line opens with a4.
Every sentence here is computed from the setup itself and can be checked on the board.
Balance
MBI 43 Morozov Balance Index: 43 of 100 — class C — noticeable edge.
- Engine evaluation of the starting position: +28 centipawns for White (depth 46, 400 000 000 nodes).
- Rank 533 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 (60 half-moves): +48 → 0 → 0
Position facts
- Mirror twin: position #72
- The king starts on c, the rooks on a and e
- It becomes the daily position in 40 days
Puzzles from this position
- Attack on the uncastled king: bishop to h5 (d1·4) — Chess960 specifics · 780
- Winning blow: knight to c8 (d6·2) — Chess960 specifics · 780
- Attack on the uncastled king: bishop to e6 (c4·2) — Chess960 specifics · 780
- Attack on the uncastled king: pawn to b5 (a4·34) — Chess960 specifics · 920
- Winning blow: knight to f5 (e7·2) — Chess960 specifics · 970
- Attack on the uncastled king: queen to g7 (d4·2) — Chess960 specifics · 1110
- Attack on the uncastled king: bishop to c5 (g1·12) — Chess960 specifics · 1200
- Winning blow: queen to e7 (f6) — Chess960 specifics · 1280
- Attack on the uncastled king: bishop to a6 (e2·6) — Chess960 specifics · 1420
- Chess960 tactic on d7 (d1·4) — Chess960 specifics · 2350
This position appears in course day 71
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Commentary
The king already stands on c1, so long castling moves the rook alone; the rooks are on a1 and e1. The bishops are on d1 and g1, one on each colour. Among the pawns, g2 is the one that begins without a defender. The queen stands on b1, right beside the king, and the knights are on f1 and h1 — both can reach g3, so a knight move there has to name its file. The engine opens on the wing with a4, and White's edge is +28 centipawns: a4 Nhg6 e4 e5 Ne3 Ne6.
Written from the measured facts above and checked against the board before publishing. All 960 positions have one.