1. d2d4  1... d7d5  2. c2c4  2... e7e6  3. g1f3  3... g8f6  4. b1c3  4... a7a6 [%c_effect a6;square;a6;type;Interesting;persistent;true] This is a popular variation these days. The idea is to threaten the capture of the c4-pawn, similar to what happens in the Semi-Slav Defense, which occurs after 4...c6. The difference is that, it seems, the move 5.Bg5 is worse for White in this case: Black can confidently take the c4-pawn.   So how should White defend the pawn $2 If they capture on d5 (the most popular choice), then Black clears the way for the bishop on c8. It's worth mentioning that the move a7-a6 is not a waste of time in this case, since the move has some use (for example, if White tries the famous minority attack).   If White plays 5.c5, as she does in the game, then Black can immediately break the structure with b7-b6.   In short: this move is better than it looks $1 5. c4c5  5... b7b6  6. c5b6  6... c7b6  7. c1f4  7... f8d6  8. e2e3  8... e8g8  9. f1d3  9... c8b7  10. e1g1  10... b8c6  11. a1c1 A natural move; how can you resist putting the rook on an open file $2 It's worth mentioning, however, that the creative GM Dubov tried another move and got a victory in 2021. 11... h7h6 A clever move, avoiding Bg5 once and for all. 12. a2a3 This move, however, doesn't seem convincing to me. I offer some alternatives: 12... d6f4 The first new move. 13. e3f4  13... d8d6 Black's play is natural. She attacks the f4-pawn and connects the rooks. 14. g2g3  14... a8c8  15. f1e1  15... c6e7 A bit passive. Taking the knight to c4 seems more attractive. 16. f3e5  16... c8c7  17. d1e2  17... b6b5  18. c3a2  18... f8c8  19. c1c7  19... c8c7  20. a2c1 [%c_effect c1;square;c1;type;GreatFind;persistent;true] Goryachkina wants to exploit the dark-square weaknesses on the queenside. The knight will be a monster on c5, but Black is in time to avoid the journey. 20... b5b4 [%c_effect b4;square;b4;type;GreatFind;persistent;true] The only move, but it's enough. 21. c1b3  21... b4a3  22. b2a3  22... f6e4  23. e2b2  23... d6b6  24. e1b1  24... f7f6  25. e5g4 [%c_effect g4;square;g4;type;GreatFind;persistent;true] The best square. The knight is heading to e3. 25... e7f5  26. g4e3  26... f5d6  27. d3e4  27... d6e4  28. f2f3  28... e4c3  29. b1c1  29... c3a4  30. b2d2  30... c7c1  31. b3c1 The position is still close to equality, but it's more comfortable for Black. The bishop can be activated with ...a5 and ...Ba6 and the d4-pawn is a weakness. 31... a6a5  32. g1g2 [%c_effect g2;square;g2;type;GreatFind;persistent;true] This move is useful, taking the king off the g1-a7 diagonal and thereby setting up counterplay with the f4-f5 move. 32... a4b2  33. d2c3  33... b2c4  34. e3c4  34... d5c4  35. c1e2 [%c_effect e2;square;e2;type;Inaccuracy;persistent;true] 35... b7d5  36. g2f2  36... a5a4  37. h2h4  37... b6b1  38. c3c1  38... b1b7  39. c1c3  39... h6h5  40. c3e3  40... g8f7  41. e3c3 White's position is passive, but looks very difficult to break. 41... b7b1  42. c3c1  42... b1a2  43. f2e3  43... a2b3  44. e2c3  44... d5c6  45. e3f2  45... f7f8  46. f2e3  46... c6e8 [%c_effect e8;square;e8;type;GreatFind;persistent;true] A very nice plan by Tan. She is ready to activate the bishop. 47. e3f2  47... e8g6  48. d4d5 Goryachkina decides to do something instead of just waiting. I think this is a good decision. 48... e6d5  49. c3d5  49... b3a2  50. f2e3  50... g6d3  51. d5c3  51... a2g2  52. c1e1 [%c_effect e1;square;e1;type;Inaccuracy;persistent;true] This move gives Black winning chances. 52... g2b2  53. c3a4  53... b2a3  54. a4c3 This endgame is extremely difficult to evaluate correctly. Objectively, Black has a decisive advantage, but a few hours' study is needed to begin to understand what the winning plan is. 54... a3b2  55. c3d5  55... f8g8 