Chess puzzle (Checkmate)
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3
O-O 9. d4 Bg4 10. d5 Nb8 11. Bg5 Nfd7 12. Bxe7 Qxe7 13. Nbd2 Nc5 14. Qc2 Nbd7
15. a4 f5 16. exf5 Bxf5 17. Qc1 Nd3 18. Qd1 Nxe1 19. Qxe1 Nc5 20. Ba2 Nxa4 21.
Nd4 Bd7 22. N2f3 Qe8 23. Nc2 Nxb2 24. Qe2 Na4 25. Qe3 Qg6 26. Nb4 Bg4 27. Nh4
Qf6 28. f3 Qxh4 29. fxg4 Qxg4 30. Nc6 Rf4 31. Ne7+ Kh8 32. Bb1 Raf8 33. Bd3 Nc5
34. Be2 Qg5 35. Qh3 Qxe7 36. Rf1 Rxf1+ 37. Bxf1 Qf6 38. Be2 Qf2+ 39. Kh1 Qf1+
40. Bxf1 *
Position (FEN): 5r1k/2p3pp/p2p4/1pnPp3/8/2P4Q/6PP/5B1K b - - 0 40
Black to move.
Themes:  Endgame Back Rank Mate, Mate in 1 
Puzzle rating: 448
Best move: Rxf1#