context: 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  14. g5h6 Accurate play - Firouzja will give no chance until the end of the game. 14... f5e4  15. f3g5 Another precise move. 15... e4e3 Black has many pieces attacked and desperately seek counterplay. 16. g5e6  16... d8f6  17. c4c5 The knight on d5 wasn't really threatened since White can play Bg2-d5, so other moves are possible: