With simple moves Wei forced Black on the defensive  and now it is not clear how is he going to finish the development.
1. g1f3  1... d7d5  2. b2b3  2... c8f5  3. c1b2  3... e7e6  4. d2d3  4... h7h6  5. b1d2  5... g8f6  6. g2g3  6... c7c5  7. f3e5  7... b8d7 A mechanical, obvious move and a novelty. And... a  mistake. 8. e2e4  8... f5h7  9. e5d7  9... d8d7 