[%c_effect a6;square;a6;type;Mistake;persistent;true]
1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g1f3  3... d7d5  4. b1c3  4... c7c6  5. c1g5  5... h7h6  6. g5f6 A solid choice. 6.Bh4 is the most aggressive option and leads to chaotic positions if Black accepts the pawn with 6...dxc4. 6... d8f6  7. e2e3  7... b8d7  8. a1c1  8... g7g6  9. f1d3  9... f6e7  10. e1g1  10... f8g7  11. f1e1  11... e8g8  12. d1c2  12... d5c4  13. d3c4  13... f8d8 This is a typical position from the Semi-Slav. Black has the pair of bishops while White has more space, more freedom, and attacking chances. As usually is the case, the pawn structure will dictate the plans for both sides. Always look to the breaking points in the pawn chain. White can play for h4-h5 at some point (maybe after gaining space with e4-e5). A rupture on d5 with e5-d5 is also possible. Meanwhile, Black can strive, after finishing development, for a break with …c7-c5 and in some rare cases with …e6-e5. Another pawn play is also possible for Black, as we're about to see. 14. a2a3  14... a7a5 A new move. 15. c4a2  15... b7b5 [%c_effect b5;square;b5;type;GreatFind;persistent;true] Black's idea becomes clear: he wants to play …b5-b4, dislodging the knight and creating active play. This is a plan typical of Wei's dynamic style. 16. e3e4 [%c_effect e4;square;e4;type;Inaccuracy;persistent;true] This allows Black to achieve a good position. 16... b5b4  17. c3a4  17... c8b7  18. c2b3  18... a8b8 Wei misses a few chances to play the desired …c6-c5 in this game. 19. b3e3  19... b7a6 [%c_effect a6;square;a6;type;Inaccuracy;persistent;true] 20. e4e5  20... b4a3  21. b2a3  21... g7f8  22. c1c3 [%c_effect c3;square;c3;type;GreatFind;persistent;true] Now this is possible. 22... a6b5  23. a4c5  23... d7c5  24. c3c5  24... e7b7 [%c_effect b7;square;b7;type;Inaccuracy;persistent;true] 25. c5c3 