Starting position #507
Back-rank setup: RQNKBNRB
SP-507 · 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 a1 and g1, the queen on b1.
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.
A bishop starts in the corner on h1: it has a single diagonal, which the g-pawn unlocks, running out to a8.
Every pawn on the second rank is defended from the very first move.
The setup belongs to the ThroneGuard family; read right to left it becomes position 545.
The engine's main line opens with c3.
Every sentence here is computed from the setup itself and can be checked on the board.
Balance
MBI 59 Morozov Balance Index: 59 of 100 — class B — balanced.
- Engine evaluation of the starting position: +24 centipawns for White (depth 46, 400 000 000 nodes).
- Rank 400 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 (60 half-moves): +28 → -11 → +1 → 0
Position facts
- Mirror twin: position #545
- The king starts on d, the rooks on a and g
- It becomes the daily position in 585 days
Puzzles from this position
- Winning blow: knight to a5 — Chess960 specifics · 780
- Winning blow: rook to e3 (e1·4) — Chess960 specifics · 920
- Winning blow: king to g2 (g3·2) — Chess960 specifics · 970
- Mate in 2: queen to c8 (d8) — Chess960 specifics · 1090
- Winning blow: rook to a6 (a1·3) — Chess960 specifics · 1200
- Winning blow: knight to g6 (e5·8) — Chess960 specifics · 1290
- Attack on the uncastled king: rook to d3 (a3·2) — Chess960 specifics · 1340
- Winning blow: rook to b1 (f1·5) — Chess960 specifics · 1560
- Attack on the uncastled king: queen to e7 (b7) — Chess960 specifics · 1860
- Chess960 tactic on d1 — Chess960 specifics · 2120
This position appears in course day 151
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Commentary
The king begins on d1 and castling is ordinary in both directions, with the rooks on a1 and g1. Every pawn on the second rank begins with a defender — this setup concedes nothing on move one. A bishop holds the corner on h1 with one diagonal to a8; the second bishop is on e1. The queen is on b1, the knights on c1 and f1. The line in the dataset opens c3 c6, then d4 g5 g4 d5.
Written from the measured facts above and checked against the board before publishing. All 960 positions have one.