1. d2d4  1... g8f6  2. c2c4  2... g7g6  3. b1c3  3... d7d5 Not a major surprise; the Gruenfeld remains  Vachier-Lagrave's main choice against 1.d4. 4. g1f3  4... f8g7  5. d1b3  5... d5c4  6. b3c4  6... c8e6  7. c4a4  7... e6d7  8. a4b3  8... c7c5  9. d4d5  9... b7b5 Since White has a lost a few tempi shuffling his queen back and forth, Black has all the reasons to play aggressively. 10. c3b5  10... b8a6  11. b5c3  11... a8b8  12. b3d1  12... d8a5  13. d1d2 This move, which was played  instantly, is a novelty which will hardly be repeated ever. Aronian might  have confused something. 13... a6b4  14. e2e4  14... d7a4 This might have been missed by White.  Vachier-Lagrave creates very concrete threats, which cannot be parried. No wonder, Black has almost all his pieces out, whereas Aronian uses less  than half his army. 15. b2b3  15... a4b3  16. a1b1  16... b3c2 The rook is trapped. 17. b1b3  17... c2b3  18. a2b3  18... f6d7 Black won material, but does not slow his  initiative. Now that the long diagonal has been opened more trouble awaits Aronian. 19. c1b2  19... e8g8 Simple and good.