Chess puzzle (Checkmate)
Opening: Caro-Kann_Defense, Caro-Kann_Defense_Advance_Variation
Moves: 1. e4 c6 2. d4 d5 3. e5 Bf5 4. f4 e6 5. Nf3 Nd7 6. c3 h6 7. Bd3 Ne7 8. Nh4 Bxd3
9. Qxd3 c5 10. f5 exf5 11. Nxf5 cxd4 *
Position (FEN): r2qkb1r/pp1nnpp1/7p/3pPN2/3p4/2PQ4/PP4PP/RNB1K2R w KQkq - 0 12
White to move.
Themes:  Opening Mate in 1, Smothered Mate 
Puzzle rating: 1311
Best move: Nd6#