Chess puzzle (Checkmate)
Opening: Sicilian_Defense, Sicilian_Defense_Grand_Prix_Attack
Moves: 1. e4 c5 2. Nc3 Nc6 3. f4 g6 4. Nf3 Bg7 5. Bb5 d6 6. O-O Bd7 7. d3 a6 8. Bxc6
Bxc6 9. Qe1 e6 10. f5 exf5 11. exf5+ Ne7 12. Ng5 Bd4+ 13. Kh1 gxf5 14. Rxf5 Rf8
15. Nxh7 Rg8 16. Ne4 Nxf5 *
Position (FEN): r2qk1r1/1p3p1N/p1bp4/2p2n2/3bN3/3P4/PPP3PP/R1B1Q2K w q - 0 17
White to move.
Themes: Double Check Middlegame Mate in 1 
Puzzle rating: 1220
Best move: Nef6#