Chess Puzzle #SFtJg — Advanced, Black to move, middlegame

Position

White: king g1; rooks a1/c7; bishop d6; knight c3; pawns a2/b2/c2/g2/h2. Black: king g8; rook f8; bishop d4; knight e4; pawns a6/c6/g6/h7. White is ahead by 6 points of material. Black to move.

Solution (3 moves)

1. Opponent setup: Kh1 — king g1→h1. Now Black to move.
2. Best move: Nf2+ — knight e4→f2, gives check. Opponent replies Kg1 (king h1→g1).
3. Best move: Nd1+ — knight f2→d1, gives check. Opponent replies Kh1 (king g1→h1).
4. Best move: Rf1# — rook f8→f1, delivers checkmate.

Tactical themes

back rank mate, discovered attack, long, mate, mate in 3, middlegame. The combination ends with Rf1# delivering checkmate.

Position data

FEN: 5rk1/2R4p/p1pB2p1/8/3bn3/2N5/PPP3PP/R5K1 w - - 1 21

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