Chess Puzzle #ggOn4 — Expert, Black to move, middlegame

Position

White: king d1; queen g4; rook h1; pawns a3/c4/f3. Black: king h7; queen g5; bishops c2/c3; pawns a7/b7/d4/g7/h6. Black is ahead by 3 points of material. Black to move.

Solution (4 moves)

1. Opponent setup: Kxc2 — king d1→c2, captures bishop. Now Black to move.
2. Best move: Qd2+ — queen g5→d2, gives check. Opponent replies Kb3 (king c2→b3).
3. Best move: Qb2+ — queen d2→b2, gives check. Opponent replies Ka4 (king b3→a4).
4. Best move: b5+ — pawn b7→b5, gives check. Opponent replies cxb5 (pawn c4→b5, captures pawn).
5. Best move: Qc2# — queen b2→c2, delivers checkmate.

Tactical themes

endgame, exposed king, master, mate, mate in 4, very long. The combination ends with Qc2# delivering checkmate.

Position data

FEN: 8/pp4pk/7p/6q1/2Pp2Q1/P1b2P2/2b5/3K3R w - - 0 34

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