Chess Puzzle #OjYtz — Advanced, Black to move, endgame

Position

White: king d5; pawns a6/b5/e4/g4. Black: king a7; pawns c5/e5/f4/g5. Material is balanced. Black to move.

Solution (4 moves)

1. Opponent setup: Kxc5 — king d5→c5, captures pawn. Now Black to move.
2. Best move: f3 — pawn f4→f3. Opponent replies b6+ (pawn b5→b6, gives check).
3. Best move: Kxa6 — king a7→a6, captures pawn. Opponent replies Kc6 (king c5→c6).
4. Best move: f2 — pawn f3→f2. Opponent replies b7 (pawn b6→b7).
5. Best move: f1=Q — pawn f2→f1, promotes to queen.

Tactical themes

advanced pawn, endgame, equality, pawn endgame, promotion, very long. The key move is f3.

Position data

FEN: 8/k7/P7/1PpKp1p1/4PpP1/8/8/8 w - - 0 51

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