Is it a mental block?

This is a game between Nakamura and Carlsen in London

Nakamura vs Carlsen (London Chess Classic - round 6)

1 e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Nf6 5. Nxc6 bxc6 6. e5 Qe7 7. Qe2 Nd5 8. h4 Bb7 9. c4 Nb6 10. Rh3 Qe6 11. f4 O-O-O 12. a4 d5 13. a5 Nxc4 14. b3 Bb4+ 15. Kf2 Nxa5 16. Bd2 c5 17. Rxa5 Bxa5 18. Bxa5 Qf5 19. Nc3 Qxf4+ 20. Kg1 Rhe8 21. Nb5 a6 22. Rf3 Qxe5 23. Qxe5 Rxe5 24. Bxc7 Ree8 25. Bxd8 Rxd8 26. Na3 Rd7 27. Bd3 Kd8 28. Bxh7 g6 29. h5 gxh5 30. Rf6 Ke7 31. Rb6 Rc7 32. Nc2 a5 33. Ne3 c4 34. Bc2 Bc6 35. bxc4 dxc4 36. Ra6 a4 37. Bxa4 Be4 38. Ra5 Ke6 39. Rxh5 c3 40. Bb3+ Kd6 41. Bc2 Bxc2 42. Nxc2 Ke6 43. Kf2 f5 44. Rh3 Ke5 45. Rd3 Kf4 46. Rd4+ Kg5 47. Kf3 Rc8 48. Ra4 Rc7 49. Ra8 Kf6 50. Ra6+ Kg5 51. Nd4 Rc4 52. Ne6+ Kf6

Nakamura reached a relatively easy winning endgame position against Carlsen in London. All he had to do is to put his Rook on c1 or c2. With the help of the Knight, he can easily win the c pawn and it is game over.

  1. Nf4+ Ke5 54. Nd3+ Kd5 55. Ra2 Kd4 56. Nc1 c2 57. Ra5 Rc3+ 58. Kf4 Rc8 59. Rxf5 Re8 60. Rf7 Re1 61. Rd7+ Kc3

For some inexplicable reasons, he could not find this easy winning idea and gave Carlsen a lucky escape. Time was not an issue as he had plenty of time.

  1. Rc7+ Kd2 63. Nb3+ Kd3 64. Nc5+ Kd4 65. Nb3+ Kd3 66. Nc5+ Kd4 67. Nb3+ Kd3 68. g4 Rf1+ 69. Kg5 Rb1 70. Nc5+ Ke3 71. Nb3 Kd3 72. Nc5+ Ke3 73. Nb3 ½-½

So what is it? Is it purely technique or is it a mental thing?

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