Trap the rook on b7
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The tactical motive
Trapped piece: an enemy piece has no safe squares — catch it.
Difficulty 1806 ShuffleRating — for advanced tacticians.
Black to move — find the best continuation
How to recognize this tactic
A trapped piece has no safe square. Spot an enemy piece that has wandered offside or been hemmed in, then play the move that takes away its last escape and wins it — often a quiet pawn push or a covering minor piece.
General method: before you move, list the forcing candidates — every check, every capture, every direct threat — and calculate those first. The solution to a tactic is almost always among them.
Position on the board
White: king g1, queen a7, rook b1 d1, bishop g2 e3, knight b5, pawn h2 b3 f3 g3 a4 c4 e4.
Black: king g8, queen d8, rook b8 f8, bishop e6 g7, knight c5, pawn b6 d6 g6 e7 f7 h7.
14 white and 13 black pieces are on the board; the puzzle position arises after move 18.
The position in numbers
White are ahead by 1 points of material (35 against 34; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on g1, the black king on g8.
It is Black to move on move 18, with 37 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 7 pawns, Black 6. No file is fully open, so the heavy pieces have to be pried in. Half-open for Black: a, c.
The Black king has 1 empty squares to step to right now — the fewer they are, the closer a mating net.
Solution & explanation
Main line
18... Rb7 19. Qxb7 Nxb7
Why it works
- Great move! rook to b7 keeps the pressure (+3.1).
- Well found: knight to b7 (+3.1).
- You win a piece — the queen.
- If instead Qxb7, then Nxb7 and you win the queen.
Move by move
- 18… Rb7 — rook to b7
- 19. Qxb7 — queen to b7 (capture)
- Nxb7 — knight to b7 (capture)
Types in this puzzle
Quiet move
No check, no capture — yet this modest move decides the game.
A quiet move gives no check and takes nothing — yet it decides the game by creating an unstoppable threat or stealing the king's last square. This is the hardest class of moves: the eye hunts for loud blows while a modest shift does the winning. The clue: every forcing try runs into a defense, so seek the move that strengthens the threat or takes squares away. Train yourself to ask: what if I neither capture nor check, but quietly improve?
Provenance
Derived from the Lichess puzzle database (CC0).
Verified by Stockfish at depth 20+.
Solution forcedness confirmed (verified).
Pack 013
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