Chess puzzle (Checkmate)
Opening: Ruy_Lopez, Ruy_Lopez_Steinitz_Defense
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. Nc3 Bd7 5. d4 exd4 6. Nxd4 Be7 7. O-O a6 8.
Bxc6 bxc6 9. Re1 c5 10. Nf5 Bxf5 11. exf5 c6 12. Qf3 Nf6 13. Qxc6+ Nd7 14. Nd5
O-O 15. Nxe7+ Kh8 16. b3 Ne5 17. Rxe5 dxe5 18. f6 *
Position (FEN): r2q1r1k/4Nppp/p1Q2P2/2p1p3/8/1P6/P1P2PPP/R1B3K1 b - - 0 18
Black to move.
Themes:  Middlegame Back Rank Mate, Mate in 1 
Puzzle rating: 609
Best move: Qd1#