Chess puzzle (Checkmate)
Opening: Blackmar-Diemer_Gambit, Blackmar-Diemer_Gambit_Blackmar_Gambit
Moves: 1. d4 d5 2. e4 dxe4 3. f3 exf3 4. Nxf3 Bg4 5. h3 Bxf3 6. Qxf3 c6 7. Be3 e6 8.
Nc3 Be7 9. O-O-O Nf6 10. Bd3 Nbd7 11. g4 Nd5 12. Nxd5 cxd5 13. Rdf1 Kf8 *
Position (FEN): r2q1k1r/pp1nbppp/4p3/3p4/3P2P1/3BBQ1P/PPP5/2K2R1R w - - 2 14
White to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 500
Best move: Qxf7#