Chess Puzzle #6zIKs — Master, White to move, endgame

Position

White: king d4; pawns a5/e5/g5. Black: king b5; pawns a6/e6/f7/g6. Black is ahead by 1 point of material. White to move.

Solution (8 moves)

1. Opponent setup: Kxa5 — king b5→a5, captures pawn. Now White to move.
2. Best move: Kc5 — king d4→c5. Opponent replies Ka4 (king a5→a4).
3. Best move: Kd6 — king c5→d6. Opponent replies Kb3 (king a4→b3).
4. Best move: Ke7 — king d6→e7. Opponent replies a5 (pawn a6→a5).
5. Best move: Kxf7 — king e7→f7, captures pawn. Opponent replies a4 (pawn a5→a4).
6. Best move: Kxe6 — king f7→e6, captures pawn. Opponent replies a3 (pawn a4→a3).
7. Best move: Kf7 — king e6→f7. Opponent replies a2 (pawn a3→a2).
8. Best move: e6 — pawn e5→e6. Opponent replies a1=Q (pawn a2→a1, promotes to queen).
9. Best move: e7 — pawn e6→e7.

Tactical themes

advanced pawn, endgame, equality, pawn endgame, very long. The key move is Kc5.

Position data

FEN: 8/5p2/p3p1p1/Pk2P1P1/3K4/8/8/8 b - - 0 50

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