Time Trouble Hell for Nakamura

What time trouble can do........Carlsen wins when Nakamura gets the short end of a Queen exchange. 68.Qg8 is a crusher. 

[Event "Fischer Random Rapid 2018"]

[White "Carlsen, Magnus"]

[Black "Nakamura, Hikaru"]

[Site "Baerum NOR"]

[Round "4"]

[Annotator "Prime"]

[Result "1-0"]

[Date "2018.02.10"]

[PlyCount "102"]

[Setup "1"]

[FEN "rb3rk1/1q1p2pp/p1n1p3/1p6/4P3/4NP2/PP1Q1BPP/2R2RK1 b - - 0 17"]

{[#]} 17... Bf4 18. Bg3 Bxg3 19. hxg3 Rac8 20. Ng4 Ne7 21. Qg5 Ng6 22. Rxc8 Rxc8 23. Rd1 Rc2 24. Qd8+ Nf8 25. Kh2 Rc5 26. Rd6 b4 27. Rb6 Qa7 28. e5 Rc8 29. Qe7 Ng6 30. Qxb4 h5 31. Rb7 Qc5 32. Qe4 hxg4 33. Qxg6 Qd5 34. Rb3 gxf3 35. Rxf3 Rf8 36. Rd3 Qxe5 37. Rxd7 Rf5 38. Rd8+ Rf8 39. Rd7 Rf5 40. Rd8+ Rf8 41. Rxf8+ Kxf8 42. b4 Qe2 43. a4 Qa2 44. a5 Qc4 45. Qb1 Kg8 46. Qe1 Kh7 47. Qe3 Qxb4 48. Qd3+ g6 49. Qxa6 Qc5 50. Qb6 Qh5+ 51. Kg1 Qd1+ 52. Kf2 Qd2+ 53. Kf3 g5 54. Qxe6 Qxa5 55. Kg4 Qa8 56. Qf7+ Kh8 57. Qh5+ Kg7 58. Qxg5+ Kh8 59. Kh3 Qa1 60. Qd8+ Kg7 61. Qe7+ Kg8 62. g4 Qc3+ 63. Kh4 Qb2 64. Qe8+ Kg7 65. Qd7+ Kg6 66. Qd6+ Kg7 67. Qd5 Kg6 68. Qg8+ 1-0