Chess Puzzle #9yWJk — Advanced, Black to move, middlegame

Position

White: king b1; queen d2; rooks c1/h1; bishops b5/d4; knight e4; pawns b2/f3/g5/h2. Black: king g8; queen e6; rooks a8/b8; bishops a4/g7; pawns c7/d6/f7/g6/h7. White is ahead by 2 points of material. Black to move.

Solution (4 moves)

1. Opponent setup: Bxg7 — bishop d4→g7, captures bishop. Now Black to move.
2. Best move: Qa2+ — queen e6→a2, gives check. Opponent replies Kxa2 (king b1→a2, captures queen).
3. Best move: Bc2+ — bishop a4→c2, gives check. Opponent replies Qa5 (queen d2→a5).
4. Best move: Rxa5+ — rook a8→a5, captures queen, gives check. Opponent replies Ba4 (bishop b5→a4).
5. Best move: Rxa4# — rook a5→a4, captures bishop, delivers checkmate.

Tactical themes

discovered attack, fork, mate, mate in 4, middlegame, sacrifice, very long. The combination ends with Rxa4# delivering checkmate.

Position data

FEN: rr4k1/2p2pbp/3pq1p1/1B4P1/b2BN3/5P2/1P1Q3P/1KR4R w - - 0 20

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