Chess puzzle (Checkmate)
Opening: Vienna_Game, Vienna_Game_Vienna_Gambit
Moves: 1. e4 e5 2. Nc3 Nf6 3. f4 exf4 4. e5 Ng8 5. Nf3 g6 6. d4 Bg7 7. Bxf4 Ne7 8. Bd3
O-O 9. Qd2 Nbc6 10. O-O-O a6 11. a3 b5 12. Bh6 d5 13. Bxg7 Kxg7 14. h4 b4 15.
axb4 Nxb4 16. Nb1 *
Position (FEN): r1bq1r2/2p1npkp/p5p1/3pP3/1n1P3P/3B1N2/1PPQ2P1/1NKR3R b - - 1 16
Black to move.
Themes:  Middlegame Mate in 1, Smothered Mate 
Puzzle rating: 926
Best move: Na2#