An excellent idea to generate queenside play,  even at expense of some material.
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  13. e1g1  13... b7b5 Aronian decided to give back the pawn at once. 14. c2e4  14... c8b7  15. e4g4  15... d8d5  16. f2f3 