Chess puzzle (Checkmate)
Opening: French_Defense, French_Defense_Classical_Variation
Moves: 1. e4 e6 2. d4 Nf6 3. Nc3 d5 4. Bd3 c5 5. e5 Ng8 6. Nf3 c4 7. Bg5 Ne7 8. Be2
Bd7 9. O-O a5 10. b3 b5 11. a4 b4 12. Nb5 c3 *
Position (FEN): rn1qkb1r/3bnppp/4p3/pN1pP1B1/Pp1P4/1Pp2N2/2P1BPPP/R2Q1RK1 w kq - 0 13
White to move.
Themes:  Middlegame Mate in 1, Smothered Mate 
Puzzle rating: 1222
Best move: Nd6#