1. d2d4  1... g8f6  2. g1f3  2... g7g6  3. c2c4  3... f8g7  4. b1c3  4... e8g8  5. e2e4  5... d7d6 When in for a must-win, KID it is! 6. f1e2  6... b8d7 Avoiding 6...e5 7.dxe5. The old classical reply  against the Classical line had a boost of interest in the past few years. 7. e1g1  7... e7e5  8. c1e3  8... f6g4  9. e3g5  9... f7f6  10. g5h4  10... h7h5  11. h2h3  11... g4h6  12. h4g3  12... g8h7  13. d1c2  13... c7c6  14. a1d1  14... d8e7  15. c4c5 White is often sacrificing a pawn for  positional compensation in the KID. However, Nakamura felt c4-c5 was not a good idea as things got murky there. Exactly what he needed. 15... d6c5  16. d4d5  16... d7b6  17. d5c6  17... b7c6  18. c3a4  18... b6a4  19. c2a4 It takes time for Carlsen to regain his pawn and  that allows Black a chance to activate his pieces and aim at other pawns. 19... a8b8 Now a forcing line starts: 20. b2b3  20... b8b4  21. a4c6  21... c8b7  22. c6d7  22... f8f7  23. d7e7  23... f7e7  24. f3d2  24... b7e4 And Black is again up a pawn, this time in the endgame. Carlsen can at least hope that the bishop pair will boost his defensive chances. 25. d2e4  25... b4e4  26. e2c4  26... e4d4 Later Nakamura regretted this move. 27. f2f3  27... e7d7  28. d1a1  28... h6f5  29. g3f2  29... g7h6 Apparently seen from afar. The connected  passers, the dominance on the dark-squares and the weak white king are  superior factors than the exchange. 30. f1e1  30... h6d2  31. f2d4 This this is forced. 31... c5d4  32. e1d1  32... d2e3  33. g1h2  33... h5h4  34. b3b4 The natural desire is to  advance the passers as soon as possible. However, Carlsen loses grip of  the position now and his pieces start to hang. 34... e3f4  35. h2g1  35... f5e3 A fork. 36. d1c1  36... d4d3  37. c4b5  37... d7d4  38. c1c7  38... h7h6  39. c7d7 Missed by Black. The only chance to stop the pawns from  promoting. 39... d4b4 Frustration. 40. b5d3  40... b4b2  41. d3f1  41... e3f5  42. a2a4  42... f4e3  43. g1h2  43... e3d4 Black's initiative persists even without the passers,  although Carlsen's chances significantly improved. 44. a1c1  44... f5e3  45. a4a5  45... b2f2  46. h2g1 The only move, under the discovered threats. 46... f2a2  47. a5a6  47... e3f1  48. g1f1  48... a2f2  49. f1e1  49... f2g2  50. f3f4 With seconds on the clock, the world  champion could not calculate properly whether he had the time to  demonstrate activity and chose the simplest move instead. Nakamura thought it was strong as 51.Rcc7 might follow, but there was something better. 50... g2g1 The final phase of the game will be a complex rook endgame. 51. e1d2  51... d4e3  52. d2e3  52... g1c1  53. f4e5  53... c1e1  54. e3f3  54... e1e5  55. d7a7  55... e5a5 Now Nakamura was not sure if this is winning or not. 56. a7a8  56... a5a3  57. f3g4  57... a3a4  58. g4f3  58... h6g5 