Chess puzzle (Checkmate)
Opening: Scotch_Game, Scotch_Game_Steinitz_Variation
Moves: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Qh4 5. Nxc6 Qxe4+ 6. Be3 dxc6 7. Nc3 Qe6
8. b3 Bb4 9. Qd2 Nf6 10. Bc4 Qe5 11. O-O-O Bxc3 *
Position (FEN): r1b1k2r/ppp2ppp/2p2n2/4q3/2B5/1Pb1B3/P1PQ1PPP/2KR3R w kq - 0 12
White to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 850
Best move: Qd8#