Attack on the uncastled king: queen to b8 (c8)
c9-18546naming tag (square·N)The tactical motive
Chess960 twist: use the unusual starting setup of the pieces.
Uncastled king: the enemy king is stuck in the centre — punish it before it castles.
Winning tactic: there is a move that gains a decisive advantage — find it.
Difficulty 1870 ShuffleRating — for advanced tacticians.
White to move — find the best continuation
Position on the board
White: king f1, queen c8, rook c1 h1, bishop d1 e3, knight e1, pawn a2 h2 d3 g3 b4 e4 e5.
Black: king f8, queen b8, rook h8, bishop h7 d8, pawn h5 a6 d7 e7 f7 g7.
14 white and 11 black pieces are on the board; the puzzle position arises after move 16.
Solution & explanation
Main line
16. Qxb8 O-O 17. Rc8 Kh8 18. Rxd8
Why it works
- Great move! queen to b8 keeps the pressure (+12.2).
- Well found: rook to c8 (+12.5).
- Precise: rook to d8 is the top choice (+13.1).
- You win a piece — the queen.
- If instead O-O, then Rc8 and you win the queen.
Types in this puzzle
Hanging piece
A piece is left without protection — just take it.
A hanging piece is simply an unprotected piece you can take for free. It sounds primitive, yet most amateur games are decided exactly this way. Build the habit: before every move, sweep the board and note every undefended piece, yours and theirs. The classic mistake is hunting for a brilliant combination when all you need to do is bend down and pick up the gift.
Uncastled king
The king lingered in the middle — punish the delay.
Punishing the uncastled king: your opponent delayed castling, and now his king is stuck on its starting square under fire. In Chess960 this is deadlier than in classical chess — the king may start in the center or near the edge, and the familiar defensive setups simply do not apply. The signs: the victim still holds castling rights, and the files toward his king are half-open. Open lines before the king manages to hide.
About this position
These pieces come from starting position #109.
SP-109 · BastionGuard — The king starts one file off-centre, on c or f, with neither knight in a corner.
The king starts on f1, the rooks on c1 and h1, the queen on a1.
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.
The bishops stand on d1 and g1; their long diagonals reach h5 and a7 once the e- and f-pawns step aside.
Every pawn on the second rank is defended from the very first move.
The setup belongs to the BastionGuard family; read right to left it becomes position 856.
The engine's main line opens with h3.
Morozov Balance Index: 94 of 100 — class A — most balanced. Engine evaluation of the starting position: +10 centipawns for White (depth 49, 400 000 000 nodes).
Explore position #109Provenance
Mined from the project's engine self-play games.
Pack 014 · SP-109
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