Chess puzzle (Checkmate)
Opening: Caro-Kann_Defense, Caro-Kann_Defense_Advance_Variation
Moves: 1. e4 c6 2. d4 d5 3. e5 Bf5 4. Nf3 e6 5. c4 Bg4 6. Nc3 a6 7. Be3 Nd7 8. Bd3
dxc4 9. Bxc4 b5 10. Be2 Ne7 11. Ne4 Bxf3 *
Position (FEN): r2qkb1r/3nnppp/p1p1p3/1p2P3/3PN3/4Bb2/PP2BPPP/R2QK2R w KQkq - 0 12
White to move.
Themes:  Opening Mate in 1, Smothered Mate 
Puzzle rating: 1356
Best move: Nd6#