1. g1f3  1... d7d5  2. e2e3  2... c7c5  3. b2b3 Ju hadn't managed to pose opening problems with her traditional repertoire up to this point in the match, so she starts experimenting with new lines. In round seven, she tried the Caro-Kann and in this round, instead of going for the main lines of the Queen's Pawn, she decides to aim for a slower setup. 3... b8c6  4. c1b2  4... a7a6  5. g2g3 It's a bit strange to play e3 and g3 in the opening, as the main idea of both moves is to free the path of the bishop. We need to understand that White is not interested in achieving an advantage right after the opening in this game. She is aiming at a long positional struggle without forcing variations. 5... d8c7 This move looks a bit superficial. 6. d2d4 I found no games in my database with this position. This is certainly not a common situation after move six of a world championship match. 6... c5d4  7. e3d4  7... c8g4  8. f1g2  8... e7e6  9. e1g1  9... g8f6  10. b1d2  10... f8d6 The bishop seems more comfortable on e7, without having to worry about the advance of c4-c5. 11. c2c4  11... e8g8  12. a2a3  12... a6a5 Avoiding White's plan with c4-c5 followed by b3-b4. 13. h2h3  13... g4h5  14. d1e2  14... f8d8  15. a1c1  15... d5c4 One of the most difficult strategic decisions in chess is when to release the central tension. 16. b3c4  16... d6e7  17. e2e3  17... a8c8  18. f1e1  18... h5g6 It's time for White to decide on a plan of action. This is usually what happens after all the pieces are developed. 19. e3b3 The queen is well placed on this square. The pawn on a5 is not something that Black wants. 19... c7b8  20. c4c5 [%c_effect c5;square;c5;type;GreatFind;persistent;true] A good moment to advance the pawn. The knight is going to c4. Black must react quickly. 20... f6d5  21. d2c4  21... a5a4 [%c_effect a4;square;a4;type;GreatFind;persistent;true] An excellent move. Black cannot stand still, for example: 22. b3a4  22... b7b5 [%c_effect b5;square;b5;type;GreatFind;persistent;true] This is Lei's idea. 23. c5b6 