A strange-looking move, but were there any reasonable  alternatives?
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  10. f1g2 With simple moves Wei forced Black on the defensive  and now it is not clear how is he going to finish the development.