Chess puzzle (Checkmate)
Opening: Horwitz_Defense, Horwitz_Defense_Other_variations
Moves: 1. d4 e6 2. c4 d6 3. Nc3 Nc6 4. e4 Bd7 5. d5 Ne5 6. f4 Ng6 7. Nf3 exd5 8. cxd5
Nh4 9. Be3 Bg4 10. Bb5+ Ke7 11. O-O Nf6 12. Nxh4 Bxd1 *
Position (FEN): r2q1b1r/ppp1kppp/3p1n2/1B1P4/4PP1N/2N1B3/PP4PP/R2b1RK1 w - - 0 13
White to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1218
Best move: Nf5#