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.