Chess puzzle (Checkmate)
Moves: 1. d4 Nf6 2. Nc3 d5 3. Bg5 c6 4. f3 Nbd7 5. Qd2 Qb6 6. O-O-O e6 7. e4 dxe4 8.
Na4 Qb4 9. Nc3 exf3 10. Nxf3 Be7 11. a3 Qa5 12. Bc4 O-O 13. Rde1 Nb6 14. Ba2
Re8 15. Rhf1 Nbd5 16. Bxf6 Bxf6 17. Bxd5 cxd5 18. Ne5 Bxe5 19. Rxe5 Bd7 20. Rg5
b5 21. Qf2 Rf8 22. h4 b4 23. axb4 Qa1+ 24. Kd2 Qxb2 25. h5 Rac8 26. Rg3 Qxb4
27. h6 f5 28. Rxg7+ Kh8 29. Qg3 Qxd4+ 30. Kc1 Qxc3 31. Qxc3 Rxc3 32. Rxd7 Rfc8
33. Rf2 a5 34. g4 a4 35. Kb2 f4 36. g5 a3+ 37. Ka2 Rxc2+ 38. Rxc2 Rxc2+ 39.
Kxa3 Rg2 *
Position (FEN): 7k/3R3p/4p2P/3p2P1/5p2/K7/6r1/8 w - - 1 40
White to move.
Themes:  Endgame, Rook Endgame Mate in 1 
Puzzle rating: 897
Best move: Rd8#