Chess puzzle (Checkmate)
Opening: Sicilian_Defense, Sicilian_Defense_Chekhover_Variation
Moves: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Qxd4 Nc6 5. Bb5 Bd7 6. Bxc6 bxc6 7. Nc3 e6 8.
Be3 c5 9. Qd3 a6 10. e5 d5 11. Bf4 d4 12. Ne4 Ne7 *
Position (FEN): r2qkb1r/3bnppp/p3p3/2p1P3/3pNB2/3Q1N2/PPP2PPP/R3K2R w KQkq - 2 13
White to move.
Themes:  Middlegame Mate in 1, Smothered Mate 
Puzzle rating: 1068
Best move: Nd6#