Chess puzzle (Checkmate)
Opening: Blackmar-Diemer_Gambit_Accepted, Blackmar-Diemer_Gambit_Accepted_Ryder_Gambit
Moves: 1. d4 Nf6 2. Nc3 d5 3. e4 dxe4 4. f3 exf3 5. Qxf3 Nc6 6. Bb5 Bd7 7. Nge2 a6 8.
Ba4 b5 9. Bb3 e6 10. O-O Bd6 11. Ne4 Nxe4 *
Position (FEN): r2qk2r/2pb1ppp/p1nbp3/1p6/3Pn3/1B3Q2/PPP1N1PP/R1B2RK1 w kq - 0 12
White to move.
Themes: Attacking f2 or f7 Opening Mate in 1 
Puzzle rating: 560
Best move: Qxf7#