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

Position

White: king e1; rook a3; bishop d4; pawn g2. Black: king b1; rook b2; pawns a2/b5/d6. White is ahead by 1 point of material. White to move.

Solution (7 moves)

1. Opponent setup: a1=Q — pawn a2→a1, promotes to queen. Now White to move.
2. Best move: Rxa1+ — rook a3→a1, captures queen, gives check. Opponent replies Kxa1 (king b1→a1, captures rook).
3. Best move: g4 — pawn g2→g4. Opponent replies b4 (pawn b5→b4).
4. Best move: g5 — pawn g4→g5. Opponent replies Kb1 (king a1→b1).
5. Best move: Bxb2 — bishop d4→b2, captures rook. Opponent replies Kxb2 (king b1→b2, captures bishop).
6. Best move: g6 — pawn g5→g6. Opponent replies b3 (pawn b4→b3).
7. Best move: g7 — pawn g6→g7. Opponent replies Kc2 (king b2→c2).
8. Best move: g8=Q — pawn g7→g8, promotes to queen.

Tactical themes

advanced pawn, crushing, endgame, pin, promotion, quiet move, very long. The key move Rxa1+ captures with check, forcing a response.

Position data

FEN: 8/8/3p4/1p6/3B4/R7/pr4P1/1k2K3 b - - 7 50

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