Chess Puzzle #TcOAp — Advanced, White to move, endgame

Position

White: king f4; pawns c5/f5/g6/h6. Black: king g8; rook f8; pawns a5/b7/c6. Black is ahead by 4 points of material. White to move.

Solution (7 moves)

1. Opponent setup: a4 — pawn a5→a4. Now White to move.
2. Best move: Kg5 — king f4→g5. Opponent replies a3 (pawn a4→a3).
3. Best move: f6 — pawn f5→f6. Opponent replies Rxf6 (rook f8→f6, captures pawn).
4. Best move: Kxf6 — king g5→f6, captures rook. Opponent replies a2 (pawn a3→a2).
5. Best move: h7+ — pawn h6→h7, gives check. Opponent replies Kh8 (king g8→h8).
6. Best move: g7+ — pawn g6→g7, gives check. Opponent replies Kxh7 (king h8→h7, captures pawn).
7. Best move: Kf7 — king f6→f7. Opponent replies Kh6 (king h7→h6).
8. Best move: g8=Q — pawn g7→g8, promotes to queen.

Tactical themes

advanced pawn, crushing, endgame, exposed king, promotion, rook endgame, very long. The key move is Kg5.

Position data

FEN: 5rk1/1p6/2p3PP/p1P2P2/5K2/8/8/8 b - - 1 51

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