Chess puzzle (Checkmate)
Opening: Scotch_Game, Scotch_Game_Other_variations
Moves: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Nxd4 5. Qxd4 b6 6. Nc3 Bb7 7. Bf4 c5 8.
Qc4 Qf6 9. Be3 Nh6 10. O-O-O Ng4 11. Qb5 a6 *
Position (FEN): r3kb1r/1b1p1ppp/pp3q2/1Qp5/4P1n1/2N1B3/PPP2PPP/2KR1B1R w kq - 0 12
White to move.
Themes:  Opening Mate in 1 
Puzzle rating: 505
Best move: Qxd7#