Black has two good alternatives to this move.
1. d2d4  1... g8f6  2. c2c4  2... g7g6  3. b1c3  3... d7d5  4. d1b3 Arjun and Vachier-Lagrave are two creative and aggressive players. A no-holds-barred battle was expected, and they didn't disappoint. They have different styles of opening play: while Arjun can try anything, Vachier-Lagrave sticks to his favorite openings. The theoretical battle starts early—the move 4.Qb3 is not very popular. 4... d5c4  5. b3c4  5... c8e6 This is the way to exploit White's move order. 6. c4b5  6... e6d7  7. b5b3  7... c7c5 This move is the basis of all of Black's counterplay in the Grunfeld defense. 8. d4d5  8... b7b5 Sacrificing a pawn to exploit the lead in development. White's opening strategy looks a bit dubious. 9. e2e4 Arjun refuses the pawn. 9... b5b4 Black advances the wrong pawn. 10. e4e5 A forced reply. Otherwise, White loses the e-pawn. 10... b4c3 A new move and also an inaccuracy. 11. e5f6 Black's position is difficult now. 11... d8b6  12. g1e2 A creative reaction. 12... b6f6  13. e2c3  13... f8g7  14. f1e2  14... e8g8  15. e1g1  15... d7c8 A good defensive move, preventing ...Qb7 and preparing Nd7 and Ba6. 16. c1e3  16... b8d7  17. b3a3  17... c8b7  18. f1d1  18... f8d8  19. a1c1  19... f6h4 An excellent idea to create counterplay. 20. e2b5 A natural reply, preparing either Bxd7 or Bc6.