Challenge: find the move, or move-chain sequence that would give black a draw. Where did black go wrong? I don't see any obvious inaccuracies, mistakes, or blunders here.
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e6 7. O-O Be7 8. f4 O-O 9. Kh1 Qc7 10. a4 Nc6 11. Be3 Re8 12. Bf3 Rb8 13. Qd2 Bd7 14. Nb3 b6 15. g4 Bc8 16. g5 Nd7 17. Qf2 Bf8 18. h4 Na5 19. Nd2 d5 20. exd5 exd5 21. Rac1 Bb7 22. Nxd5 Qd6 23. Nc3 Qb4 24. Bxb7 Nxb7 25. Nd5 Qxb2 26. Bd4 Qa2 27. c4 Nbc5 28. Qg2 Rbc8 29. h5 Nb3 30. Nxb3 Qxb3 31. h6 Rxc4 32. Bxg7 Rce4 33. Nc3 Rc4 34. Rb1 Qa3 35. Nd5 Qc5 36. Bxf8 Kxf8 37. Rbd1 Ree4 38. Qf3 b5 39. axb5 axb5 40. Kg2 Qc6 41. Rfe1 Rxe1 42. Rxe1 Rc1 43. Re3 b4 44. Kh3 Qc4 45. Kg3 Ra1 46. Nc7 Qxc7 47. Qe4 Ne5 48. Qxb4+ Qe7 49. Qxe7+ Kxe7 50. Rxe5+ Kf8 51. Rb5 Ra8 52. f5 Kg8 53. Rb7 Rc8 54. Kf4 Re8 55. Ra7 Rf8 56. Ke5 f6+ 57. Ke6 Re8+ 58. Re7 Ra8 59. Kxf6 Rf8+ 60. Ke5 Ra8 61. g6 Ra5+ 62. Kf6 Ra8 63. Rxh7 Ra6+ 64. Kg5 Rxg6+ 65. Kxg6 Kf8 66. Ra7 Ke8 67. h7 Kd8 68. h8=Q#
Are you not aware that any decent engine will answer these questions for you? Here, it finds many second-best moves, but move 40 appears to just be a blunder.
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