1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... f8b4  4. d1c2 A must-win situation for Yu. He  needs to choose as complex lines as possible. 4... e8g8  5. e2e4  5... d7d5  6. e4e5  6... f6e4  7. a2a3  7... b4c3  8. b2c3  8... c7c5  9. c1b2  9... b8c6  10. f1d3  10... f7f5  11. g1e2 A novelty. White continues completing  his development, but at the expense of a pawn. 11... d5c4  12. d3e4  12... f5e4 