Starting position #112
Back-rank setup: BBNQRNKR
SP-112 · 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 e1 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.
The pawn on f2, g2 is defended by the king alone — the same soft spot f2 is in the classical setup.
The setup belongs to the RampartGuard family; read right to left it becomes position 847.
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 21 Morozov Balance Index: 21 of 100 — class D — largest edge.
- Engine evaluation of the starting position: +36 centipawns for White (depth 45, 400 000 000 nodes).
- Rank 761 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 (48 half-moves): +44 → +15 → 0
Position facts
- Mirror twin: position #847
- The king starts on g, the rooks on e and h
- King and rook are neighbours — castling from adjacent squares feels unusual
- It becomes the daily position in 1114 days
Puzzles from this position
- Attack on the uncastled king: rook to h6 — Chess960 specifics · 780
- Attack on the uncastled king: bishop to d4 (a1·15) — Chess960 specifics · 920
- Winning blow: rook to f5 (f6) — Chess960 specifics · 1010
- Winning blow: knight to f7 (h6·4) — Chess960 specifics · 1280
- Winning blow: knight to e5 (f3·14) — Chess960 specifics · 1280
- Attack on the uncastled king: queen to d7 (g4·2) — Chess960 specifics · 1290
- Winning blow: queen to e5 (f4·6) — Chess960 specifics · 1420
- Mate in 3: queen to f8 (a3) — Chess960 specifics · 1630
- Winning blow: queen to e5 (c5·2) — Chess960 specifics · 1870
- Chess960 tactic on f5 (e4·2) — Chess960 specifics · 2120
This position appears in course day 95
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Commentary
Both f2 and g2 rely on the king alone, an unusual pair of soft squares next to each other. The king is already on g1, so short castling moves the rook from h1 to f1. A bishop is closed into the corner on a1 with a single diagonal to h8; the second works the light squares from b1. The queen holds d1, the knights c1 and f1. The main line of the run opens c4 c5, then Nd3 Nd6 h4 h5.
Written from the measured facts above and checked against the board before publishing. All 960 positions have one.