Chess puzzle (Checkmate)
Opening: Blackmar-Diemer_Gambit, Blackmar-Diemer_Gambit_Gedult_Gambit
Moves: 1. d4 d5 2. e4 dxe4 3. f3 exf3 4. Nxf3 Bg4 5. Bc4 e6 6. O-O c6 7. h3 Bh5 8. g4
Bg6 9. Ne5 Bd6 10. Nxg6 hxg6 11. Qf3 Nd7 *
Position (FEN): r2qk1nr/pp1n1pp1/2pbp1p1/8/2BP2P1/5Q1P/PPP5/RNB2RK1 w kq - 2 12
White to move.
Themes: Attacking f2 or f7 Opening Mate in 1 
Puzzle rating: 400
Best move: Qxf7#