Starting position #592
Back-rank setup: BBRQNKRN
SP-592 · BastionScout — A knight on the a- or h-file, king on c or f — the mirror twin lands here as well.
Move the pieces right on the board — full Chess960 rules, castle by dropping the king on the rook.
Position features
The king starts on f1, the rooks on c1 and g1, the queen on d1.
Castling short simply swaps the two pieces: the king on f1 and the rook on g1 trade places.
A bishop starts in the corner on a1: it has a single diagonal, which the b-pawn unlocks, running out to h8.
One second-rank pawn starts with no defender at all: h2.
The setup belongs to the BastionScout family; read right to left it becomes position 271.
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 4 Morozov Balance Index: 4 of 100 — class D — largest edge.
- Engine evaluation of the starting position: +50 centipawns for White (depth 46, 400 000 000 nodes).
- Rank 924 of 960 by balance — 1 is the most balanced start.
- Balance band L — large edge · dynamics along the play-out: volatile
- Evaluation along the engine's main line (60 half-moves): +29 → +76 → +53 → +20
Position facts
- Mirror twin: position #271
- The king starts on f, the rooks on c and g
- King and rook are neighbours — castling from adjacent squares feels unusual
- It becomes the daily position in 67 days
Puzzles from this position
- Winning blow: knight to e4 — Chess960 specifics · 780
- Attack on the uncastled king: knight to e4 (g3·9) — Chess960 specifics · 780
- Attack on the uncastled king: knight to g5 (f3·17) — Chess960 specifics · 920
- Winning blow: king to d2 (e1·10) — Chess960 specifics · 970
- Winning blow: rook to h3 (d3) — Chess960 specifics · 1110
- Mate in 2: queen to h7 (c2·4) — Chess960 specifics · 1320
- Mate in 2: rook to g6 (c6·2) — Chess960 specifics · 1450
- Winning blow: rook to e8 (e5·5) — Chess960 specifics · 1510
- Mate in 3: queen to f7 (c4·3) — Chess960 specifics · 1860
- Attack on the uncastled king: rook to e7 (e1·8) — Chess960 specifics · 2100
This position appears in course day 56
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Commentary
Short castling swaps the king on f1 with the rook on g1. A bishop is shut into the corner on a1 with a single diagonal to h8; the second works the light squares from b1. Among the pawns, h2 is the one that begins without a defender. The queen is on d1, the knights on e1 and h1 — the cornered one has g3 as its only move. White's edge here is a wide one, +50 centipawns: c4 c5 g3 g6 b3 e5.
Written from the measured facts above and checked against the board before publishing. All 960 positions have one.