Chess Puzzle #AtWvg — Intermediate, White to move, endgame

Position

White: king d2; queen c8; pawn b6. Black: king g4; queen b3; pawns g5/h4. Black is ahead by 1 point of material. White to move.

Solution (4 moves)

1. Opponent setup: Kg3 — king g4→g3. Now White to move.
2. Best move: Qc3+ — queen c8→c3, gives check. Opponent replies Qxc3+ (queen b3→c3, captures queen, gives check).
3. Best move: Kxc3 — king d2→c3, captures queen. Opponent replies h3 (pawn h4→h3).
4. Best move: b7 — pawn b6→b7. Opponent replies h2 (pawn h3→h2).
5. Best move: b8=Q+ — pawn b7→b8, promotes to queen, gives check.

Tactical themes

advanced pawn, crushing, endgame, promotion, queen endgame, very long. The key move is Qc3+.

Position data

FEN: 2Q5/8/1P6/6p1/6kp/1q6/3K4/8 b - - 1 45

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