Chess Puzzle #Zwdab — Advanced, Black to move, middlegame

Position

White: king g1; queen a4; rooks a1/d1; bishop c4; pawns a3/b6/e5/f2/h2. Black: king b8; queen h6; rook f8; bishop f5; pawns a6/b7/g2/g4/h7. White is ahead by 5 points of material. Black to move.

Solution (4 moves)

1. Opponent setup: Bxa6 — bishop c4→a6, captures pawn. Now Black to move.
2. Best move: g3 — pawn g4→g3. Opponent replies fxg3 (pawn f2→g3, captures pawn).
3. Best move: Qe3+ — queen h6→e3, gives check. Opponent replies Kxg2 (king g1→g2, captures pawn).
4. Best move: Be4+ — bishop f5→e4, gives check. Opponent replies Qxe4 (queen a4→e4, captures bishop).
5. Best move: Qxe4+ — queen e3→e4, captures queen, gives check.

Tactical themes

advantage, middlegame, sacrifice, very long. The key move Qxe4+ captures with check, forcing a response.

Position data

FEN: 1k3r2/1p5p/pP5q/4Pb2/Q1B3p1/P7/5PpP/R2R2K1 w - - 0 28

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