Attack on the uncastled king: pawn to c5 (b4·29)
sf-u-0007naming tag (square·N)The tactical motive
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.
Chess960 twist: use the unusual starting setup of the pieces.
Difficulty 780 ShuffleRating — for beginners taking their first steps in Chess960 tactics.
White to move — find the best continuation
Position on the board
White: king g1, queen b1, rook a1 f1, bishop d1 e1, knight g3, pawn a2 e2 f2 g2 h2 b4 c4.
Black: king f8, queen c5, rook a8 g8, bishop d8 e8, knight b6 g6, pawn d4 a7 b7 d7 f7 g7 h7.
14 white and 15 black pieces are on the board; the puzzle position arises after move 8.
Solution & explanation
Main line
8. bxc5 Nxc4 9. Qxb7 Nge5 10. Qxa8
Why it works
- Great move! pawn to c5 keeps the pressure (+6.5).
- Spot on — queen to b7 (+6.4).
- Precise: queen to a8 is the top choice (+7.2).
- You win a piece — the queen.
- If instead O-O, then cxb6 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.
Development punish
Half the army still asleep — the attack breaks through.
Punishing lazy development: half of your opponent's army is asleep on its starting squares, which means you outnumber him where the fight is. Count not the pieces on the board but the pieces in play — if five or more of his pieces have never moved, look for a forcing attack. The sign is a development lead plus open lines toward his king. Strike immediately: give him two quiet moves and the advantage evaporates.
Provenance
Mined from the project's engine self-play games.
Verified by Stockfish at depth 20+.
Solution forcedness confirmed (verified).
Pack 003
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