Chess puzzle (Checkmate)
Opening: Four_Knights_Game, Four_Knights_Game_Halloween_Gambit
Moves: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Nxe5 Nxe5 5. d4 Nc6 6. d5 Ne5 7. f4 Ng6 8. e5
Ng8 9. Be2 d6 10. O-O dxe5 11. Re1 exf4 *
Position (FEN): r1bqkbnr/ppp2ppp/6n1/3P4/5p2/2N5/PPP1B1PP/R1BQR1K1 w kq - 0 12
White to move.
Themes: Double Check Opening Mate in 1 
Puzzle rating: 859
Best move: Bb5#