Chess puzzle (Checkmate)
Opening: Sicilian_Defense, Sicilian_Defense_Dragon_Variation
Moves: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Bg5 Bg7 7. Nf3 O-O 8.
Qd2 a6 9. Bh6 Nc6 10. Bxg7 Kxg7 11. h4 h5 12. Nh2 Qb6 13. O-O-O Be6 14. f3 Rac8
15. g4 Nb4 16. a3 Rxc3 17. bxc3 *
Position (FEN): 5r2/1p2ppk1/pq1pbnp1/7p/1n2P1PP/P1P2P2/2PQ3N/2KR1B1R b - - 0 17
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 858
Best move: Na2#