Starting position #773
Back-rank setup: QRBBKNRN
SP-773 · ThroneScout — King in the middle of the rank, with a knight already committed to the corner.
Move the pieces right on the board — full Chess960 rules, castle by dropping the king on the rook.
Position features
The king starts on e1, the rooks on b1 and g1, the queen on a1.
Castling ends where it always does: king to g1 and rook to f1 on the short side, king to c1 and rook to d1 on the long one.
The bishops stand on c1 and d1; their long diagonals reach h6 and h5 once the d- and e-pawns step aside.
Every pawn on the second rank is defended from the very first move.
The setup belongs to the ThroneScout family; read right to left it becomes position 186.
The engine's main line opens with b4.
Every sentence here is computed from the setup itself and can be checked on the board.
Balance
MBI 51 Morozov Balance Index: 51 of 100 — class C — noticeable edge.
- Engine evaluation of the starting position: +26 centipawns for White (depth 45, 400 000 000 nodes).
- Rank 457 of 960 by balance — 1 is the most balanced start.
- Balance band M — moderate edge · dynamics along the play-out: stable
- Evaluation along the engine's main line (58 half-moves): +41 → +10 → +31 → +12
Position facts
- Mirror twin: position #186
- The king starts on e, the rooks on b and g
- It becomes the daily position in 322 days
Puzzles from this position
- Attack on the uncastled king: queen to g8 (a2) — Chess960 specifics · 620
- Attack on the uncastled king: knight to h4 (f5) — Chess960 specifics · 780
- Winning blow: rook to b8 (b4) — Chess960 specifics · 780
- Winning blow: queen to a5 (a1) — Chess960 specifics · 920
- Winning blow: pawn to a8 (a7·4) — Chess960 specifics · 1110
- Mate in 2: queen to g8 (g3·2) — Chess960 specifics · 1320
- Winning blow: rook to c7 (f7·6) — Chess960 specifics · 1510
- Mate in 3: king to g1 — Chess960 specifics · 1630
- Mate in 3: queen to e5 (a1·6) — Chess960 specifics · 1980
- Chess960 tactic on g6 (g4) — Chess960 specifics · 2250
This position appears in course day 9
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Commentary
Castling is ordinary in both directions from e1, with the rooks on b1 and g1. Every pawn on the second rank begins with a defender — this setup concedes nothing on move one. The bishops stand side by side on c1 and d1, one on each colour. The queen begins in the far corner on a1, the knights on f1 and h1 — both can reach g3, so the third half-move carries a letter. The line runs b4 b5 Nhg3 Nhg6 e4 e5.
Written from the measured facts above and checked against the board before publishing. All 960 positions have one.