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

Position

White: king g1; queen d1; rooks a1/f1; bishops b2/d3; knight d2; pawns a2/b3/c2/c6/d4/g2. Black: king c8; queen h4; rook h8; bishop g3; knight h5; pawns a7/b7/c7/e6/g7. White is ahead by 9 points of material. Black to move.

Solution (4 moves)

1. Opponent setup: Nf3 — knight d2→f3. Now Black to move.
2. Best move: Bf2+ — bishop g3→f2, gives check. Opponent replies Rxf2 (rook f1→f2, captures bishop).
3. Best move: Qh1+ — queen h4→h1, gives check. Opponent replies Kxh1 (king g1→h1, captures queen).
4. Best move: Ng3+ — knight h5→g3, gives check. Opponent replies Kg1 (king h1→g1).
5. Best move: Rh1# — rook h8→h1, delivers checkmate.

Tactical themes

attraction, discovered check, double check, kingside attack, mate, mate in 4, middlegame, sacrifice, very long. The combination ends with Rh1# delivering checkmate.

Position data

FEN: 2k4r/ppp3p1/2P1p3/7n/3P3q/1P1B2b1/PBPN2P1/R2Q1RK1 w - - 1 20

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