Aronian decided that the c4-pawn is more valuable.
1. g1f3  1... d7d5  2. g2g3  2... g8f6  3. f1g2  3... g7g6  4. e1g1  4... f8g7  5. d2d4  5... e8g8  6. c2c4  6... c7c6  7. d1b3  7... d8b6 A  solid line in which Black holds well against the Fianchetto line in the  Grunfeld. 8. f1d1  8... c8f5  9. b3a3 A novelty. Firouzja wants to avoid the endgame. 9... d5c4  10. f3e5 