Chess Puzzle #Ys9iF — Master, White to move, endgame

Position

White: king g5; pawns a5/f3/g4. Black: king c5; pawns a6/b7/c6/f4. Black is ahead by 1 point of material. White to move.

Solution (7 moves)

1. Opponent setup: Kb4 — king c5→b4. Now White to move.
2. Best move: Kxf4 — king g5→f4, captures pawn. Opponent replies c5 (pawn c6→c5).
3. Best move: Ke3 — king f4→e3. Opponent replies Ka3 (king b4→a3).
4. Best move: g5 — pawn g4→g5. Opponent replies c4 (pawn c5→c4).
5. Best move: Kd4 — king e3→d4. Opponent replies Kb3 (king a3→b3).
6. Best move: g6 — pawn g5→g6. Opponent replies c3 (pawn c4→c3).
7. Best move: g7 — pawn g6→g7. Opponent replies c2 (pawn c3→c2).
8. Best move: g8=Q+ — pawn g7→g8, promotes to queen, gives check.

Tactical themes

advanced pawn, crushing, endgame, pawn endgame, promotion, quiet move, very long. The key move Kxf4 wins material.

Position data

FEN: 8/1p6/p1p5/P1k3K1/5pP1/5P2/8/8 b - - 0 53

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