Chess puzzle (Checkmate)
Opening: Alekhine_Defense, Alekhine_Defense_Modern_Variation
Moves: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 e6 5. Bd3 c5 6. c3 Qa5 7. O-O dxe5 8. Nxe5
Nc6 9. Re1 Bd6 10. Qf3 Bxe5 11. dxe5 Bd7 12. Nd2 b5 13. Ne4 O-O-O 14. Nd6+ Kb8
15. Bxb5 a6 16. Bxc6 Bxc6 17. Nxf7 Rdf8 18. c4 *
Position (FEN): 1k3r1r/5Npp/p1b1p3/q1pnP3/2P5/5Q2/PP3PPP/R1B1R1K1 b - - 0 18
Black to move.
Themes: Hanging Piece, Kingside Attack Middlegame Mate in 1 
Puzzle rating: 531
Best move: Qxe1#