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

Position

White: king f1; rook a6; pawn a7. Black: king e5; bishop e6; pawns f2/g3. White is ahead by 1 point of material. Black to move.

Solution (4 moves)

1. Opponent setup: a8=Q — pawn a7→a8, promotes to queen. Now Black to move.
2. Best move: Bc4+ — bishop e6→c4, gives check. Opponent replies Kg2 (king f1→g2).
3. Best move: f1=Q+ — pawn f2→f1, promotes to queen, gives check. Opponent replies Kxg3 (king g2→g3, captures pawn).
4. Best move: Qf4+ — queen f1→f4, gives check. Opponent replies Kg2 (king g3→g2).
5. Best move: Bd5+ — bishop c4→d5, gives check.

Tactical themes

advanced pawn, crushing, endgame, exposed king, fork, promotion, very long. The key move is Bc4+.

Position data

FEN: 8/P7/R3b3/4k3/8/6p1/5p2/5K2 w - - 1 50

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