Chess Puzzle #iy1Q0 — Expert, Black to move, middlegame

Position

White: king b2; queen h7; rook g6; bishop e5; pawns a5/b4. Black: king c6; rook f1; bishop a8; knights d5/d6; pawns a6/b5/c3/d4. White is ahead by 1 point of material. Black to move.

Solution (4 moves)

1. Opponent setup: Kc2 — king b2→c2. Now Black to move.
2. Best move: Nxb4+ — knight d5→b4, captures pawn, gives check. Opponent replies Kb3 (king c2→b3).
3. Best move: Rb1+ — rook f1→b1, gives check. Opponent replies Ka3 (king b3→a3).
4. Best move: Nc2+ — knight b4→c2, gives check. Opponent replies Ka2 (king a3→a2).
5. Best move: Rb2# — rook b1→b2, delivers checkmate.

Tactical themes

exposed king, mate, mate in 4, middlegame, very long. The combination ends with Rb2# delivering checkmate.

Position data

FEN: b7/7Q/p1kn2R1/Pp1nB3/1P1p4/2p5/1K6/5r2 w - - 0 50

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