1. g1f3  1... d7d5  2. g2g3  2... g7g6  3. d2d4  3... g8f6  4. f1g2  4... f8g7  5. e1g1  5... e8g8  6. a2a4 White has all sorts of moves in this position to avoid the main theory of 6.c4—this is just the eleventh most popular move, to give you an idea. The intention is to gain space on the queenside with a4-a5, but I understand that this is a bit vague. 6... a7a5 A natural move, preventing White's plan that could go ahead against 6...c6 or 6...Bf5, not that it's anything too impressive. 7. c2c3  7... c7c6  8. b1d2 Now White wants to play Re1 and then e2-e4, getting a nice pawn structure. 8... b8d7  9. f1e1  9... f8e8 Black prepares e7-e5 as well. 10. e2e4  10... d5e4  11. d2e4  11... f6e4  12. e1e4  12... d7f6  13. e4e1  13... c8e6 A big mistake that is well exploited by Nakamura. He probably knew all this from his preparation. 14. e1e6 A matter of chess culture, as Kasparov used to say. This type of exchange sac has been seen hundreds of times. It's particularly deadly in this position. 14... f7e6  15. d1e2  15... h7h6 Played in order to take the g5-square away from the knight. 16. g2h3  16... g8h7  17. h3e6  17... e8f8  18. e6b3 The bishop heads to c2 in order to attack the g-pawn. There was a more accurate way to finish the game. 18... f6d5  19. b3c2  19... d8d6  20. f3e5  20... g7e5  21. d4e5  21... d6e6  22. e2h5 Exploiting the pin. 22... f8f5  23. c2f5 A strange move, since White could take on h6 first. 23... e6f5  24. h5h6  24... h7g8  25. h6g5 Nakamura wants to exchange queens to begin the technical conversion. 25... f5e4  26. c1d2  26... a8f8  27. a1e1  27... e4c2  28. h2h4  28... g8f7  29. h4h5 There are many ways to win. 29... g6h5  30. g5h5  30... f7e6  31. h5h6  31... e6f7  32. h6h5  32... f7e6  33. h5g4  33... c2f5  34. g4f5  34... e6f5 White is two pawns up and has a winning position, but let's remember that this is a blitz game and a knight is the most treacherous piece in these situations. 35. f2f3  35... b7b5 The only chance. 36. a4b5  36... c6b5  37. e1e4  37... f5e6  38. g1g2  38... d5b6  39. b2b3 This gives Black the chance to create a passed pawn. 39... f8a8  40. d2c1  40... a5a4  41. b3a4  41... b5a4 Suddenly Black has good chances of saving the game. 42. c1a3  42... b6d5 After this move Nakamura is again in control. 43. c3c4  43... d5c3  44. e4e3  44... c3b1  45. f3f4  45... b1d2  46. e3c3  46... a8b8  47. c4c5 Passed pawns must be pushed. 47... d2e4  48. c3c4  48... e4g3 This loses by force. 49. g2g3  49... b8b3  50. g3g4  50... b3a3 