1. e2e4  1... e7e5  2. g1f3  2... g8f6  3. f3e5  3... d7d6  4. e5f3  4... f6e4  5. c2c4 This move is not known to be wildly dangerous, and while Firouzja was playing very quickly to a point, I have to believe there was a better choice available against the Petroff. 5... b8c6  6. d2d3  6... e4f6  7. d3d4  7... f8e7  8. d4d5  8... c6e5  9. f3d4  9... e8g8  10. b1c3  10... c8g4  11. f2f3 Firouzja played this move very quickly, suggesting he was still in preparation, but I'm not quite sure what he had in mind. Black's position already looks very comfortable to me and f2-f3 makes some weaknesses. “After f3 White shouldn't fight for something because of this weakness.” (Nepomniachtchi) 11... g4d7 