Chess puzzle (Checkmate)
Opening: Blackmar-Diemer_Gambit, Blackmar-Diemer_Gambit_von_Popiel_Gambit
Moves: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. Bg5 Bf5 5. f3 exf3 6. Qxf3 Nc6 7. Bb5 Bd7 8.
O-O-O a6 9. Ba4 b5 10. Bb3 b4 11. Ne4 Nxe4 *
Position (FEN): r2qkb1r/2pbpppp/p1n5/6B1/1p1Pn3/1B3Q2/PPP3PP/2KR2NR w kq - 0 12
White to move.
Themes: Attacking f2 or f7 Middlegame Mate in 1 
Puzzle rating: 733
Best move: Bxf7#