Chess puzzle (Checkmate)
Moves: 1. e4 e5 2. Nf3 Nc6 3. d4 d6 4. d5 Nd4 5. Nxd4 exd4 6. Qxd4 f6 7. Nc3 c5 8. Qd2
a6 9. Bd3 Ne7 10. O-O Ng6 11. a3 Ne5 12. Be2 Bg4 13. Bxg4 Nxg4 14. b4 c4 15.
Qe2 Ne5 16. f4 Ng6 17. Qxc4 Rc8 18. Qd3 Qb6+ 19. Kh1 Be7 20. Bd2 Nh4 21. Qg3 f5
22. exf5 Nxf5 23. Qg4 g6 24. Rfe1 Rc7 25. Qh3 Nd4 26. Rac1 O-O 27. Rf1 Nf5 28.
Ne4 Qd4 29. Qd3 Qxd3 30. cxd3 Rxc1 31. Rxc1 Nd4 32. Rc7 Bd8 33. Rxb7 Ne2 34.
Nxd6 g5 35. f5 Nf4 36. Rd7 Nxd5 37. Nb7 Rxf5 38. Rxd8+ Kg7 39. Rd7+ Kh6 40. Nd6
*
Position (FEN): 8/3R3p/p2N3k/3n1rp1/1P6/P2P4/3B2PP/7K b - - 4 40
Black to move.
Themes:  Endgame Back Rank Mate, Mate in 1 
Puzzle rating: 600
Best move: Rf1#