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. 13... a5c3 The only move. 14. b2c3  14... d5e7  15. f3e5 For the two pawns, Carlsen has gotten an overwhelming position. Firouzja can barely develop his queenside; the extra pawns have no value at all. 15... b7b5  16. c2c1 White is not hiding his intentions of a kingside visit. 16... g8h8 A slim chance... 17. c1f4 True to himself, Carlsen follows his plan without any distractions. 17... e7g8  18. e5c6 This is also great for White, but now Firouzja finds a series of great moves. 18... d8b6  19. f4d6  19... c8b7 