Chess Puzzle #pfkyi — Expert, White to move, endgame

Position

White: king c5; pawns a2/c3/g3/h3. Black: king f5; pawns a4/b5/c4/g5/h5. Black is ahead by 1 point of material. White to move.

Solution (9 moves)

1. Opponent setup: h4 — pawn h5→h4. Now White to move.
2. Best move: gxh4 — pawn g3→h4, captures pawn. Opponent replies gxh4 (pawn g5→h4, captures pawn).
3. Best move: Kxb5 — king c5→b5, captures pawn. Opponent replies Kf4 (king f5→f4).
4. Best move: Kxc4 — king b5→c4, captures pawn. Opponent replies Kg3 (king f4→g3).
5. Best move: Kb5 — king c4→b5. Opponent replies Kxh3 (king g3→h3, captures pawn).
6. Best move: c4 — pawn c3→c4. Opponent replies Kg3 (king h3→g3).
7. Best move: c5 — pawn c4→c5. Opponent replies h3 (pawn h4→h3).
8. Best move: c6 — pawn c5→c6. Opponent replies h2 (pawn h3→h2).
9. Best move: c7 — pawn c6→c7. Opponent replies h1=Q (pawn h2→h1, promotes to queen).
10. Best move: c8=Q — pawn c7→c8, promotes to queen.

Why this works

White's defensive resource is a race between two passed pawns. After 1.gxh4 gxh4, White sacrifices the b-pawn with 2.Kxb5, then the a-pawn with 3.Kxc4, creating a critical tempo advantage: the c-pawn advances while Black's king is forced to chase the h-pawn down. The sequence 4.Kb5 (stepping aside to avoid checks) 5.c4 6.c5 7.c6 8.c7 9.c8=Q shows the c-pawn queening precisely as Black's h-pawn reaches h1. The king on b5 is positioned to stop any remaining Black pawns and to support the new queen. Black cannot promote because the c-pawn queens first; White's quiet king move on move 4 is the pivot — it allows the c-pawn to advance unimpeded while the king maintains flexibility to defend against Black's kingside threats.

What to practice

In opposite-side pawn races, calculate whether your slower pawn queens before the opponent's, and whether the queening square is safe from perpetual checks or captures. The pattern here is the 'tempo-gaining sacrifice': White surrenders material (b and a pawns) to eliminate Black's pieces that could otherwise slow the c-pawn's advance. Recognize when stepping your king away from the action (4.Kb5) is superior to keeping it close—sometimes the promotion itself is the goal, not piece preservation.

Tactical themes

advanced pawn, endgame, equality, pawn endgame, promotion, quiet move, very long. The key move gxh4 wins material.

Position data

FEN: 8/8/8/1pK2kpp/p1p5/2P3PP/P7/8 b - - 3 44

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