Starting position #129
Back-rank setup: BNRBQNKR
SP-129 · RampartGuard — King pushed to the b- or g-file, knights off the edges — 144 positions here.
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 e1.
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 827.
The engine's main line opens with e4, 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 43, 400 000 000 nodes).
- Rank 740 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 (60 half-moves): +26 → +21 → 0
Position facts
- Mirror twin: position #827
- 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 858 days
Puzzles from this position
- Attack on the uncastled king: bishop to e5 (a1·6) — Chess960 specifics · 780
- Attack on the uncastled king: knight to f6 (e4·2) — Chess960 specifics · 780
- Winning blow: rook to h5 (g5) — Chess960 specifics · 920
- Attack on the uncastled king: pawn to f3 (f2·2) — Chess960 specifics · 1110
- Winning blow: rook to h6 (h1·3) — Chess960 specifics · 1280
- Winning blow: queen to f5 (c8·2) — Chess960 specifics · 1280
- Castling-960 to the rescue on c8 (g8·2) — Castling-960 · 1340
- Mate in 3: bishop to f6 (a1) — Chess960 specifics · 1630
- Winning blow: knight to e7 (f5·28) — Chess960 specifics · 1650
- Mate in 3: queen to e3 (e2) — Chess960 specifics · 1980
This position appears in course day 100
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Commentary
The rooks stand on c1 and h1 with the king on g1 between them, so short castling moves the rook alone. The corner bishop on a1 opens to h8 once the b-pawn moves; the second bishop is on d1. On the second rank, a2 begins with no defender at all, and g2 has only the king. The queen holds e1, the knights b1 and f1. The line in the dataset opens e4 e5, then b3 h5 h4 d6.
Written from the measured facts above and checked against the board before publishing. All 960 positions have one.