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

Position

White: king d4; bishop c8; pawns e5/f4/g4/h2. Black: king b4; bishop h3; pawns a4/b6/g6/h6. Material is balanced. Black to move.

Solution (4 moves)

1. Opponent setup: e6 — pawn e5→e6. Now Black to move.
2. Best move: a3 — pawn a4→a3. Opponent replies e7 (pawn e6→e7).
3. Best move: a2 — pawn a3→a2. Opponent replies e8=Q (pawn e7→e8, promotes to queen).
4. Best move: a1=Q+ — pawn a2→a1, promotes to queen, gives check. Opponent replies Kd5 (king d4→d5).
5. Best move: Qd1+ — queen a1→d1, gives check.

Tactical themes

advanced pawn, advantage, bishop endgame, endgame, master, promotion, very long. The key move is a3.

Position data

FEN: 2B5/8/1p4pp/4P3/pk1K1PP1/7b/7P/8 w - - 0 48

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