Chess Puzzle #tE7tq — Expert, Black to move, middlegame

Position

White: king b1; queen c6; rook f6; knight f3; pawns b3/b5/c4. Black: king d3; queen g4; rook g1; pawns d6/e5/g6. White is ahead by 3 points of material. Black to move.

Solution (4 moves)

1. Opponent setup: Kb2 — king b1→b2. Now Black to move.
2. Best move: Qg2+ — queen g4→g2, gives check. Opponent replies Ka3 (king b2→a3).
3. Best move: Kc3 — king d3→c3. Opponent replies Nxg1 (knight f3→g1, captures rook).
4. Best move: Qb2+ — queen g2→b2, gives check. Opponent replies Ka4 (king a3→a4).
5. Best move: Qa2# — queen b2→a2, delivers checkmate.

Tactical themes

endgame, mate, mate in 4, sacrifice, very long. The combination ends with Qa2# delivering checkmate.

Position data

FEN: 8/8/2Qp1Rp1/1P2p3/2P3q1/1P1k1N2/8/1K4r1 w - - 1 45

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