comment: The only move.
context: 1. d2d4  1... d7d5  2. c2c4  2... e7e6  3. g1f3  3... g8f6  4. b1c3  4... c7c6  5. g2g3 A popular gambit which White tried earlier as well. 5... d5c4 Firouzja accepts. 6. f1g2  6... b8d7  7. a2a4  7... f8e7  8. e1g1  8... e8g8  9. a4a5  9... f6d5  10. h2h4 White's hopes are related to a central/kingside expansion. 10... e7b4 A novelty, but a risky one. Without this bishop there are no defenders left at all around the black king. 11. c1g5  11... d7f6 Also risky. 12. d1c2  12... b4a5  13. e2e4 Now White's compensation is beyond obvious.