Chess Puzzle #7dBes — Advanced, Black to move, middlegame

Position

White: king h1; queen d1; rooks a1/e1; bishops c1/e6; knight c3; pawns a2/b2/d4/f3/g2. Black: king d8; queen c7; rooks a8/g8; bishop h2; knights d7/h5; pawns a6/b5/f7/h7. White is ahead by 1 point of material. Black to move.

Solution (4 moves)

1. Opponent setup: Bxf7 — bishop e6→f7, captures pawn. Now Black to move.
2. Best move: Ng3+ — knight h5→g3, gives check. Opponent replies Kxh2 (king h1→h2, captures bishop).
3. Best move: Nf1+ — knight g3→f1, gives check. Opponent replies Kg1 (king h2→g1).
4. Best move: Qh2+ — queen c7→h2, gives check. Opponent replies Kxf1 (king g1→f1, captures knight).
5. Best move: Qxg2# — queen h2→g2, captures pawn, delivers checkmate.

Tactical themes

double check, kingside attack, mate, mate in 4, middlegame, sacrifice, very long. The combination ends with Qxg2# delivering checkmate.

Position data

FEN: r2k2r1/2qn1p1p/p3B3/1p5n/3P4/2N2P2/PP4Pb/R1BQR2K w - - 0 20

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