Black does not miss his chance. Now a bunch of pawns are  being traded.
1. e2e4  1... c7c5  2. g1f3  2... b8c6  3. f1b5  3... e7e6  4. e1g1  4... g8e7  5. f1e1  5... c6d4  6. f3d4  6... c5d4  7. c2c3  7... a7a6  8. b5f1  8... e7c6  9. b2b4 Fighting for the center from the flank. 9... f8e7  10. a2a4  10... e8g8  11. b1a3  11... d4c3 Carlsen trades the central pawn, but  does so at a moment when the opponent somewhat spoiled his coordination.  Plus, he gains a long diagonal for his bishop. 12. d2c3  12... e7f6 In a  must-win situation Vachier-Lagrave uncorks a novelty. 13. b4b5 New and interesting. 13... a6b5 Carlsen rejects the offer. 14. a3b5 Now White fixes his opening advantage. 14... d7d5  15. c1a3  15... f6e7  16. e4d5  16... e6d5  17. a3e7  17... c6e7  18. d1d4 Black's pawns are clear targets, whereas the white  ones are nicely defended by his super-knight. On top of that,  Vachier-Lagrave has the more powerful bishop and therefore the advantage. 18... e7c6  19. d4f4  19... c8e6  20. a1b1 But this is an inaccuracy that allows  the world champion a chance to equalize, almost in full.