Chess puzzle (Checkmate)
Opening: Caro-Kann_Defense, Caro-Kann_Defense_Advance_Variation
Moves: 1. e4 c6 2. d4 d5 3. e5 Bf5 4. h4 h6 5. h5 Nd7 6. Nf3 e6 7. Bd3 Bxd3 8. Qxd3
Ne7 9. Nbd2 c5 10. c4 dxc4 11. Nxc4 cxd4 *
Position (FEN): r2qkb1r/pp1nnpp1/4p2p/4P2P/2Np4/3Q1N2/PP3PP1/R1B1K2R w KQkq - 0 12
White to move.
Themes:  Middlegame Mate in 1, Smothered Mate 
Puzzle rating: 1145
Best move: Nd6#