1. d2d4  1... g8f6  2. c2c4  2... g7g6  3. b1c3  3... f8g7  4. e2e4  4... d7d6  5. h2h3  5... e8g8  6. c1e3  6... b8c6 A provocative move, in the spirit of the game Letelier-Fischer. 7. d4d5  7... c6e5  8. f2f4  8... e5d7  9. g2g4 A very unusual position arose. White has  advanced six out of his eight pawn, whereas Black has only two of them  moved, just modestly a half-move through. However, since Firouzja has  developed most of his pieces and castled he can hope to undermine the  center nicely. 9... c7c6  10. g1f3  10... c6d5  11. c4d5  11... b7b6 Black is blitzing out a novelty. Firouzja is not afraid to weaken the c6 square. 12. f3d4  12... d7c5 The point. 13. d1f3 A wise decision. It also came as a surprise for Caruana's  younger opponent. On his next two moves Black spent almost half an hour. 13... c8b7  14. g4g5  14... f6e4 But found a good continuation. There is  nothing else. If Firouzja does not use his temporary development advantage it will disappear. 15. c3e4  15... b7d5  16. e4f6 