Chess puzzle (Checkmate)
Opening: Blackmar-Diemer_Gambit_Declined, Blackmar-Diemer_Gambit_Declined_OKelly_Defense
Moves: 1. d4 d5 2. e4 c6 3. Nc3 dxe4 4. f3 Nf6 5. a3 exf3 6. Qxf3 Bg4 7. Qf2 e6 8. Bd3
Bd6 9. Nf3 h5 10. h3 Bxf3 11. Qxf3 Nbd7 12. O-O Bc7 13. Ne4 Nxe4 *
Position (FEN): r2qk2r/ppbn1pp1/2p1p3/7p/3Pn3/P2B1Q1P/1PP3P1/R1B2RK1 w kq - 0 14
White to move.
Themes: Attacking f2 or f7 Opening Mate in 1 
Puzzle rating: 581
Best move: Qxf7#