Chess puzzle (Checkmate)
Opening: Philidor_Defense, Philidor_Defense_Other_variations
Moves: 1. e4 e5 2. Nf3 d6 3. Nc3 h6 4. h3 Nf6 5. Bc4 Be7 6. d3 O-O 7. Be3 Kh8 8. Qd2
Nh7 9. Nd5 f5 10. Nxe7 Qxe7 11. g3 Nc6 12. Nh4 f4 *
Position (FEN): r1b2r1k/ppp1q1pn/2np3p/4p3/2B1Pp1N/3PB1PP/PPPQ1P2/R3K2R w KQ - 0 13
White to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 677
Best move: Ng6#