Chess puzzle (Checkmate)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Modern_Defense
Moves: 1. d4 g6 2. Bg5 Bg7 3. h4 h6 4. Bf4 Nf6 5. c3 d6 6. Nd2 Nbd7 7. f3 e5 8. dxe5
dxe5 9. Be3 Nd5 10. Bf2 N7f6 11. e4 Nf4 12. Ne2 *
Position (FEN): r1bqk2r/ppp2pb1/5npp/4p3/4Pn1P/2P2P2/PP1NNBP1/R2QKB1R b KQkq - 2 12
Black to move.
Themes:  Opening Mate in 1, Smothered Mate 
Puzzle rating: 1111
Best move: Nd3#