[%c_effect f7;square;f7;type;Mistake;persistent;true]
1. g1f3  1... d7d5  2. e2e3  2... g8f6  3. c2c4  3... e7e6  4. b1c3  4... f8d6  5. d2d4  5... b7b6  6. c4d5 I don't like this move very much, as Black's development is easier after this exchange. 6... e6d5  7. f1d3  7... e8g8  8. c1d2 [%c_effect d2;square;d2;type;Inaccuracy;persistent;true] A strange move, as the bishop is not well developed here. It seems better to castle and then develop the bishop with b3-Bb2. 8... c7c5 This natural move is a novelty. 9. d4c5  9... b6c5  10. e1g1  10... b8c6 On the board we have a position with hanging pawns (this formation with the black pawns on d5 and c5), but in a very good version for Black. His pieces are free and active, while the same cannot be said for White's pieces. 11. h2h3 Nakamura decides to avoid Bg4. 11... h7h6 Erigaisi wants to develop the bishop to e6 and this move is useful to avoid Ng5. Something to consider is White's advance with e3-e4, a typical idea in these structures and that gives chances of equality—after all, Black is already a little better. Perhaps it would be more useful to put the rook on e8 first. 12. a1c1  12... c8e6  13. c3e2  13... f6e4  14. a2a3 [%c_effect a3;square;a3;type;Inaccuracy;persistent;true] Too slow. 14... d8b6  15. e2c3 [%c_effect c3;square;c3;type;Interesting;persistent;true] 15... e4d2 This is certainly not an easy decision, as keeping the knight on e4 is very tempting. 16. d1d2  16... c5c4 This advance is necessary because White was threatening 17.Na4. 17. d3b1 [%c_effect b1;square;b1;type;Inaccuracy;persistent;true] 17... f8d8  18. f1d1  18... a8b8 Now the position is very uncomfortable for White, who lacks space. It never hurts to remember and by now my most assiduous readers already know how I like it: Black has the pair of bishops. 19. c3a4  19... b6b7  20. b1c2  20... b7e7 [%c_effect e7;square;e7;type;GreatFind;persistent;true] I like this move, improving the queen's position. 21. c1b1  21... e7f6  22. d2e2  22... g7g6 [%c_effect g6;square;g6;type;GreatFind;persistent;true] Another good move. Black has a long-term positional advantage, so it's possible to calmly improve the position. 23. d1d2  23... g8g7  24. e2d1  24... d6c7 The game gets tactical now: the idea is to play /Ba5. Black could continue to suffocate White with a move like /a5 (useful to avoid a possible pawn advance to b4) and then follow up with a plan of attack on the king-flank with /h5-g5-g4. 25. a4c5  25... e6c8 [%c_effect c8;square;c8;type;Inaccuracy;persistent;true] 26. b2b4 [%c_effect b4;square;b4;type;Inaccuracy;persistent;true] 26... c6e5  27. f3e1 It's strange to choose this square instead of the more active d4. 27... f6d6  28. c5a4  28... a7a5 [%c_effect a5;square;a5;type;GreatFind;persistent;true] Creating weaknesses on the queenside. 29. b4b5  29... c8e6  30. f2f4 A desperate attempt to create counterplay. 30... e5d7  31. e1f3  31... d6a3 Black is winning, but in a rapid game anything is possible when the players get low on time. 32. d1e1  32... d7b6  33. b1a1  33... a3e7  34. a4c3  34... b8a8  35. f4f5 [%c_effect f5;square;f5;type;Interesting;persistent;true] 35... g6f5  36. c3e2 Nakamura is a player with many resources and you have to be very careful against him, even with a decisive advantage. Erigaisi continues to play at the highest level, but the game will still have some adventures. 36... e6d7  37. e2d4  37... f5f4 [%c_effect f4;square;f4;type;GreatFind;persistent;true] 38. e3e4  38... d8e8  39. d2e2 [%c_effect e2;square;e2;type;GreatFind;persistent;true] 39... d5e4  40. c2e4  40... a8d8 It's necessary to give up the a5-pawn. 41. a1a5  41... e7f6 Black is still much better with a pawn up and a safe king. 42. a5a6 The rook is not well placed here, as the next move shows. 42... d7c8 [%c_effect c8;square;c8;type;GreatFind;persistent;true] 43. e1a1 [%c_effect a1;square;a1;type;GreatFind;persistent;true] 43... g7g8  44. d4c6  44... f6a1  45. a6a1  45... d8d6  46. a1a7  46... d6d1  47. g1h2  47... c7d6  48. c6e5  48... d6e5  49. e4c6  49... e8e6  50. f3e5  50... c4c3 [%c_effect c3;square;c3;type;GreatFind;persistent;true] The c-pawn decides the game. 51. c6f3  51... d1d2  52. e2e4  52... b6d5 [%c_effect d5;square;d5;type;Mistake;persistent;true] A blunder that throws away the win.