Accurate play - Firouzja will give no chance until the end of the game.
1. g1f3  1... d7d5  2. c2c4  2... d5d4  3. b2b4  3... g7g5 A bold move, that's for sure. 4. h2h3 A good and solid reply. 4... h7h6 The pawn must be defended sooner or later. 5. d2d3  5... f8g7  6. g2g3  6... e7e5  7. f1g2  7... g8e7 Black's plan is to castle and play f7-f5 - his position is very active. 8. b1d2  8... e8g8  9. d1b3 A new move. 9... c8e6 Considering what happens in the game, maybe it was safer for Black to play either 9...f5 or 9...Ng6, with a good position in both cases. 10. d2e4  10... b8d7  11. g3g4 Otherwise Black simply plays f7-f5. 11... e7g6 This leads to a very dangerous position for Black after Firouzja's next move. 12. h3h4 A great move by a tactical magician in his element. 12... g5h4 Black's position goes downhill very fast after this. 13. g4g5 This is the point. White threatens to take on h6 and if Black captures on g5, a dangerous knight will go to this square. 13... f7f5 