Chess puzzle (Checkmate)
Moves: 1. e4 e5 2. d4 Nc6 3. c3 Nf6 4. Nf3 d6 5. Bd3 Bg4 6. Be3 d5 7. exd5 Nxd5 8. O-O
exd4 9. cxd4 Bd6 10. Nc3 Nce7 11. h3 Bh5 12. Re1 O-O 13. Rc1 c6 14. a3 a5 15.
Ne4 Bf4 16. Nc5 Nxe3 17. fxe3 Bg3 18. Rf1 Nd5 19. Qd2 Qe7 20. Ne4 Bc7 21. Rce1
Bg6 22. Nc5 b6 23. Bxg6 fxg6 24. Nd3 Nf6 25. Nde5 Ne4 26. Qc2 Ng3 27. Rf2 c5
28. Kh2 Nf5 29. Qc4+ Kh8 30. Kg1 cxd4 31. exd4 Bxe5 32. Nxe5 Qh4 33. Ref1 Qf6
34. Nd7 Qd6 35. Nxf8 Rxf8 36. Rf4 Rd8 37. d5 Ne3 38. Qc6 Nxf1 39. Qxd6 Rxd6 *
Position (FEN): 7k/6pp/1p1r2p1/p2P4/5R2/P6P/1P4P1/5nK1 w - - 0 40
White to move.
Themes:  Endgame Back Rank Mate, Mate in 1 
Puzzle rating: 612
Best move: Rf8#