Starting position #130
Back-rank setup: BNRQNBKR
SP-130 · 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 c1 and h1, the queen on d1.
The king already stands on its castled square, so castling short moves only the rook, from h1 to f1.
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: a2.
The setup belongs to the RampartGuard family; read right to left it becomes position 823.
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 97 Morozov Balance Index: 97 of 100 — class A — most balanced.
- Engine evaluation of the starting position: +7 centipawns for White (depth 48, 400 000 000 nodes).
- Rank 32 of 960 by balance — 1 is the most balanced start.
- Balance band E — even · dynamics along the play-out: stable
- Evaluation along the engine's main line (70 half-moves): +33 → +13 → +9 → 0
- Deeper check (1 200 000 000 nodes, depth 54): +17 cp, +10 cp against the base run — verified · S — slight edge
Position facts
- Mirror twin: position #823
- The king starts on g, the rooks on c and h
- King and rook are neighbours — castling from adjacent squares feels unusual
- It becomes the daily position in 595 days
Puzzles from this position
- Attack on the uncastled king: bishop to d4 (b2·3) — Chess960 specifics · 780
- Winning blow: pawn to f8 — Chess960 specifics · 970
- Attack on the uncastled king: rook to h6 (h3) — Chess960 specifics · 1150
- Attack on the uncastled king: rook to h4 (g4·2) — Chess960 specifics · 1250
- Winning blow: knight to f6 (e4·23) — Chess960 specifics · 1420
- Winning blow: knight to c5 (e4·8) — Chess960 specifics · 1510
- Attack on the uncastled king: pawn to e5 (e4·5) — Chess960 specifics · 1610
- Mate in 3: rook to c8 (c1·2) — Chess960 specifics · 1630
- Winning blow: queen to c6 (e8·5) — Chess960 specifics · 2100
- Attack on the uncastled king: pawn to e6 (e5·10) — Chess960 specifics · 2400
This position appears in course day 85
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Commentary
A bishop is shut into the corner on a1 and waits for the b-pawn before its diagonal to h8 opens. The king is already on g1, so short castling moves the rook alone. Among the pawns, a2 starts with no defender at all, and f2 has only the king. The queen is on d1, the second bishop on f1, the knights on b1 and e1. The main line of the run opens c4 c5, then b3 e6 d4 cxd4.
Written from the measured facts above and checked against the board before publishing. All 960 positions have one.