Chess puzzle (Checkmate)
Moves: 1. d4 d5 2. c4 c6 3. Nc3 Bf5 4. Nf3 e6 5. e3 Nf6 6. cxd5 cxd5 7. Bd3 Bxd3 8.
Qxd3 Nc6 9. a3 Be7 10. O-O O-O 11. Re1 a6 12. Bd2 b5 13. b4 Nd7 14. Rac1 Nb6
15. Nxd5 Qxd5 16. e4 Qd7 17. Be3 Nc4 18. d5 N6e5 19. Nxe5 Nxe5 20. Qb3 Nc4 21.
Bd4 e5 22. Bc5 Bxc5 23. bxc5 Rfc8 24. c6 Qd6 25. a4 Rab8 26. axb5 axb5 27. Ra1
Qg6 28. Ra7 Nd2 29. Qc3 Nxe4 30. Qxe5 Nd6 31. c7 Ra8 32. Rxa8 Rxa8 33. Rc1 Rc8
34. h3 Nc4 35. Qe7 Qd6 36. Qxd6 Nxd6 37. Rc6 Ne8 38. d6 Nxd6 39. Rxd6 Rxc7 *
Position (FEN): 6k1/2r2ppp/3R4/1p6/8/7P/5PP1/6K1 w - - 0 40
White to move.
Themes:  Endgame, Rook Endgame Back Rank Mate, Mate in 1 
Puzzle rating: 599
Best move: Rd8#