Yu is demonstrating her mental power and admits her mistake. Unfortunately for her, this costed her another 11 minutes on the clock.
1. d2d4  1... g8f6  2. c2c4  2... c7c5  3. d4d5  3... g7g6  4. b1c3  4... f8g7 Krush does not hide her intentions. This is a must-win situation for her, the color of the pieces does not matter. 5. e2e4  5... d7d6  6. f2f4 Nor does Yu hide her intentions. She is transposing into the Four Pawns Attack, one of the most aggressive ways to fight the KID. 6... e8g8  7. g1f3  7... e7e6  8. d5e6  8... f7e6  9. f1e2  9... b8c6  10. e1g1  10... b7b6 Played after serious thought. The long diagonal is very tempting for the bishop, especially now that the white one is not taking care of the e4-pawn. 11. f3e1 And this novelty has been played after an even heavier thought (more than 22 minutes on the clock). 11... c8b7 With the white knight away from the g5-square this is more than justified. 12. c1e3  12... c6d4 Krush is comfortably developing and does not experience any problems whatsoever. 13. e2d3  13... d8e7 A natural move. The rooks are connected. 14. e1c2  14... f6d7 Both sides are preparing for the grand central battle. 15. a1b1 Overprotecting the b2-pawn. Yu likely believed that she will have the time to deal once and for all with the active black knight and removed from the scene with Nc3-e2, but that is too slow. 15... f8f7 