Chess puzzle (Checkmate)
Opening: French_Defense, French_Defense_Normal_Variation
Moves: 1. e4 e6 2. d4 Ne7 3. Nf3 d6 4. Nc3 Nd7 5. Be3 h6 6. Bd3 f6 7. Qd2 b6 8. O-O-O
Bb7 9. g4 c6 10. h4 d5 11. g5 dxe4 12. Nxe4 f5 *
Position (FEN): r2qkb1r/pb1nn1p1/1pp1p2p/5pP1/3PN2P/3BBN2/PPPQ1P2/2KR3R w kq - 0 13
White to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 862
Best move: Nd6#