Starting position #627
Back-rank setup: BRNKQRNB
SP-627 · ThroneGuard — Both knights start on inner files (b–g) while the king sits centrally on d or e — one of 204 positions filed 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 d1, the rooks on b1 and f1, the queen on e1.
The kingside rook already stands on f1, so castling short moves only the king, from d1 to g1.
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 ThroneGuard family; read right to left it becomes position 227.
The engine's main line opens with b3.
Every sentence here is computed from the setup itself and can be checked on the board.
Balance
MBI 75 Morozov Balance Index: 75 of 100 — class B — balanced.
- Engine evaluation of the starting position: +19 centipawns for White (depth 43, 400 000 000 nodes).
- Rank 234 of 960 by balance — 1 is the most balanced start.
- Balance band S — slight edge · dynamics along the play-out: stable
- Evaluation along the engine's main line (45 half-moves): +35 → -3 → 0
Position facts
- Mirror twin: position #227
- The king starts on d, the rooks on b and f
- It becomes the daily position in 832 days
Puzzles from this position
- Attack on the uncastled king: queen to b4 (e1) — Chess960 specifics · 780
- Attack on the uncastled king: king to c2 (d1·2) — Chess960 specifics · 780
- Attack on the uncastled king: pawn to e4 (d3·42) — Chess960 specifics · 780
- Winning blow: bishop to d4 (a1·2) — Chess960 specifics · 1060
- Winning blow: queen to f3 (f2·3) — Chess960 specifics · 1110
- Attack on the uncastled king: queen to c6 (c3·3) — Chess960 specifics · 1200
- Winning blow: queen to f5 (c5) — Chess960 specifics · 1280
- Winning blow: rook to d5 (d1·15) — Chess960 specifics · 1430
- Attack on the uncastled king: rook to h8 (h1·9) — Chess960 specifics · 1630
- Winning blow: queen to g7 (c3·6) — Chess960 specifics · 2060
This position appears in course day 66
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Commentary
The rook already occupies f1, so short castling moves the king alone from d1. Both corners hold a bishop, a1 towards h8 and h1 towards a8, each with a single diagonal. On the second rank, h2 has no defender, and c2 leans on the king alone. The queen is on e1 beside her king, the knights on c1 and g1, the second rook on b1. The line in the dataset opens b3 b6, then e4 e5 Nh3 f6.
Written from the measured facts above and checked against the board before publishing. All 960 positions have one.