A very careless move.
1. g1f3  1... g8f6  2. c2c4  2... c7c5  3. b1c3  3... d7d5  4. c4d5  4... f6d5  5. e2e3 Vachier-Lagrave has a lot of  experience in this Anti-Gruenfeld. 5... d5c3  6. d2c3  6... d8c7  7. e3e4  7... e7e6  8. f1d3 A novelty, which should have been  anticipated by the French GM. 8... f8e7  9. d1e2 Now it is some sort of Alapin Sicilian, where Black  should be careful about the possible kingside attacks as he is missing his knight on f6. 9... c8d7 Intending Bd7-c6 and Nb8-d7. 10. e1g1 