1. d2d4  1... g8f6  2. c1f4 [%c_effect f4;square;f4;type;Interesting;persistent;true] A poisonous version of the London System, often used by Erigaisi. 2... g7g6  3. b1c3 In the traditional London System this move is unthinkable, since it's the pawn that occupies this square. But they don't make London players like they used to—this variation was once the choice of those who wanted a solid position to make a draw, and nowadays it's used by people who like to play for mate. 3... d7d5 A principled move. 4. e2e3  4... f8g7  5. h2h4  5... h7h5 Stopping the advance of the h-pawn. 6. g1f3  6... c8g4 [%c_effect g4;square;g4;type;Inaccuracy;persistent;true] I'm not a big fan of this move, as the bishop isn't particularly well placed here and the f3 exchange can help White's attack by opening up the g-file. 7. d1d2 [%c_effect d2;square;d2;type;GreatFind;persistent;true] An unpleasant move, preparing to take the knight off f3. 7... g4f3 Necessary, to avoid 8.Ne5 or 8.Ng5. 8. g2f3  8... c7c6  9. e1c1  9... b8d7  10. e3e4 White's position is comfortable and easy to play. Black, on the other hand, has problems with his king, who has no safe haven. 10... e7e6  11. h1g1 A theoretical novelty that doesn't change the character of the game. 11... d7b6  12. c1b1  12... e8g8 A brave move, but it's not easy to recommend a safe path for the black king, as he's not happy on the queenside either. 13. f4g5  13... d8c7  14. f1d3  14... b6c4  15. d3c4  15... d5c4  16. f3f4 [%c_effect f4;square;f4;type;GreatFind;persistent;true] 16... g8h7 It's necessary to take the king from the column. 17. f2f3  17... b7b5  18. d2g2  18... c7d7 A prophylactic move, minimizing the strength of the break at f5. 19. g2h3  19... b5b4  20. c3a4 [%c_effect a4;square;a4;type;GreatFind;persistent;true] That's the problem: the knight is now active. 20... f6g8 [%c_effect g8;square;g8;type;Inaccuracy;persistent;true] Vachier-Lagrave threatens to capture the white bishop with f7-f6. The problem is that this threat is not that strong. 21. a4c5  21... d7c8  22. e4e5 [%c_effect e5;square;e5;type;Inaccuracy;persistent;true] 22... a7a5  23. h3f1 [%c_effect f1;square;f1;type;Interesting;persistent;true] Most chess players would be thinking of using the queen in the attack and in sacrifices like 23.f5, but Erigaisi is now starting a deep plan to gain the advantage on the other side of the board. 23... c4c3  24. b2c3 [%c_effect c3;square;c3;type;GreatFind;persistent;true] This is the point. 24... g8h6 [%c_effect h6;square;h6;type;Interesting;persistent;true] In his typical style, Vachier-Lagrave sacrifices material. 25. g5h6 [%c_effect h6;square;h6;type;GreatFind;persistent;true] Now this capture is the best, preventing the knight from reaching f5. 25... g7h6  26. c3c4  26... h6f4  27. c5e4  27... c6c5 [%c_effect c5;square;c5;type;Mistake;persistent;true] This move is a serious mistake and the reason for Black's defeat. 28. f1d3 [%c_effect d3;square;d3;type;GreatFind;persistent;true] Black's position collapses. 28... c8c7  29. e4f6  29... h7h8  30. d3e4 [%c_effect e4;square;e4;type;GreatFind;persistent;true] 30... f4h6  31. d4c5  31... a8d8  32. c5c6  32... h6g7  33. f6d7  33... f8e8  34. d1d6 Black is completely paralyzed. Both players only had seconds on the clock, but Erigaisi never loses control of the position, always choosing solid moves. 34... d8c8  35. c4c5  35... c7a7  36. f3f4  36... a5a4  37. d7b6  37... b4b3 Desperately trying some activity. 38. e4a4  38... b3a2  39. a4a2  39... a7e7  40. g1g5  40... c8c7  41. a2c4  41... e8b8  42. c2c3 [%c_effect c3;square;c3;type;Interesting;persistent;true] Opening the path for the king. 42... e7e8  43. c4e4 