Starting position #752
Back-rank setup: BBRKNNRQ
SP-752 · ThroneGuard — The king starts in the middle of the back rank, on d or e, and neither knight begins in a corner.
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 c1 and g1, the queen on h1.
Castling long simply swaps the two pieces: the king on d1 and the rook on c1 trade places.
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: f2.
The setup belongs to the ThroneGuard family; read right to left it becomes position 399.
The engine's main line opens with g4.
Every sentence here is computed from the setup itself and can be checked on the board.
Balance
MBI 8 Morozov Balance Index: 8 of 100 — class D — largest edge.
- Engine evaluation of the starting position: +45 centipawns for White (depth 44, 400 000 000 nodes).
- Rank 880 of 960 by balance — 1 is the most balanced start.
- Balance band L — large edge · dynamics along the play-out: volatile
- Evaluation along the engine's main line (60 half-moves): +78 → +61 → +145 → +207
Position facts
- Mirror twin: position #399
- The king starts on d, the rooks on c and g
- King and rook are neighbours — castling from adjacent squares feels unusual
- It is today’s daily position!
Puzzles from this position
- Attack on the uncastled king: knight to h2 — Chess960 specifics · 780
- Attack on the uncastled king: knight to g3 (f1) — Chess960 specifics · 780
- Attack on the uncastled king: pawn to e3 (d2·10) — Chess960 specifics · 780
- Attack on the uncastled king: pawn to e5 (f4·94) — Chess960 specifics · 1060
- Winning blow: pawn to f4 (e3·9) — Chess960 specifics · 1200
- Attack on the uncastled king: queen to d6 (f4·2) — Chess960 specifics · 1220
- Attack on the uncastled king: queen to d7 (c6·2) — Chess960 specifics · 1450
- Winning blow: rook to g1 (c1·2) — Chess960 specifics · 1560
- Mate in 3: queen to c8 (b7) — Chess960 specifics · 1630
- Chess960 tactic on d4 (f3) — Chess960 specifics · 2400
This position appears in course day 45
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Commentary
Long castling swaps the king on d1 with the rook on c1. A bishop is shut into the corner on a1 with a single diagonal to h8; the second works the light squares from b1. On the second rank, f2 has no defender, and e2 leans on the king alone. The queen begins in the far corner on h1, the knights side by side on e1 and f1. White's edge here is a wide one, +45 centipawns: g4 g6 c4 c6 e3 b6.
Written from the measured facts above and checked against the board before publishing. All 960 positions have one.