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 Nf6 6. Bg5 Be7 7. Nc3 O-O
8. O-O-O d6 9. f3 c5 10. Qd2 Nd7 11. Bxe7 Qxe7 12. Nd5 Qe6 13. Bc4 Rb8 14. b3
a6 15. Nb6 Qf6 16. Nd5 *
Position (FEN): 1rb2rk1/1p1n1ppp/p2p1q2/2pN4/2B1P3/1P3P2/P1PQ2PP/2KR3R b - - 3 16
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 801
Best move: Qa1#