Chess Puzzle #gaM4s — Expert, Black to move, endgame

Position

White: king g1; bishop g4; pawns g3/h4. Black: king b3; pawns a5/c4. White is ahead by 3 points of material. Black to move.

Solution (6 moves)

1. Opponent setup: Bf5 — bishop g4→f5. Now Black to move.
2. Best move: a4 — pawn a5→a4. Opponent replies h5 (pawn h4→h5).
3. Best move: a3 — pawn a4→a3. Opponent replies Bb1 (bishop f5→b1).
4. Best move: Kb2 — king b3→b2. Opponent replies h6 (pawn h5→h6).
5. Best move: Kxb1 — king b2→b1, captures bishop. Opponent replies h7 (pawn h6→h7).
6. Best move: a2 — pawn a3→a2. Opponent replies h8=Q (pawn h7→h8, promotes to queen).
7. Best move: a1=Q — pawn a2→a1, promotes to queen.

Tactical themes

advanced pawn, bishop endgame, crushing, endgame, promotion, quiet move, very long. The key move is a4.

Position data

FEN: 8/8/8/p7/2p3BP/1k4P1/8/6K1 w - - 0 42

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