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  12. f1e2  12... c7c6 I like it $1 Black opens the center and hits back at the space advantage at the source. 13. e1g1  13... c6d5  14. c4d5  14... d8b6 “After Qb6 I didn't check Qb6, so I think I am a little better there, but I couldn't find a way to be better.” (Firouzja) 15. g1h1 “I thought he had to play something like Rb1.” (Nepomniachtchi) 15... a8c8 This was the first move Firouzja spent any substantial amount of time on, and he burned his bridges right away. I don't really blame him. It's very easy to go nuts when you are having a rough tournament and he is an aggressive player in his nature, but it really looked like tilt to me. It's hard to imagine that White can launch a direct kingside attack when the center is open and Black's pieces are all active and on good squares. 16. g2g4 Brazen, but this can't be right. 16... h7h6 A very strong response. Black wants to make sure that if White launches an attack, he has to throw all of his kingside pawns, leaving his own king unsafe. White will not be able to make use of the open h-file. 17. h2h4 Not best, but I can't imagine any other move. Nobody plays g4 and then after h6 says: \"Well, that didn't work. Let's make a more normal move and ignore the fact that I just compromised my kingside.\" 17... f8e8 Black had other moves, but I really like this one. It is bold but very strong—Black allows g5 and f4 to come but just doesn't care. 18. g4g5  18... h6g5  19. h4g5  19... f6h5 Now the point of including h6 and h4 for Black is on full display. Since White lacks his h2-pawn, he is not in time to play f4. 20. h1g2 I was thinking about the position without a computer for Black, and I saw it to here. At the moment, Nepo was thinking about Rfe8. It looked unclear—f4 is coming after all, and Rh1 could be on the way too. This is why I sort of gravitated towards Nh7. Of course, that was not a bad move, but Nepo showed excellent nerves and calculation to see it a step further and know exactly what to do. 20... e5g6 Absolutely devastating. Black is ready to slam into f4 next, more or less forcing f4 from White right now. But, then the position collapses. 21. f3f4  21... h5f4 The right knight. 22. c1f4 Now, it feels so natural for Black to grab f4 and g5, winning a second pawn, getting a monster dark-squared bishop, and watching the pieces spring to life. This was not bad, but Nepo's choice was stronger. 22... b6b2 All of White's pieces are hanging and something will fall. 23. c3e4 The best move in a bad position. Now, I really like Nepo's next move as well. The computer sees something stronger, but the human move is quite sufficient. 23... c8c4  24. f4e3 Otherwise White loses a piece on the spot. Now, basic calculation—always examine all checks and captures, and the details here are actually pretty straightforward. 24... e7g5  25. a1b1  25... b2a2 Before anything else, Black grabs another pawn. He now has four pawns for the piece, and White's pieces in the center are hanging. 26. b1a1  26... c4d4 The simplest. 27. a1a2  27... d4d1 For the moment, Black is up four pawns. The most material White can take back here is an exchange, and that clearly will not cut it. 28. e2d1 The best try. 28... g5e3  29. e4d6  29... e8e7 A final, accurate move, but a very easy one. Black defends his f7-pawn and is totally winning due to his material advantage, piece activity, and the looseness of White's position, particularly around his king. 30. d1b3  30... e3c5  31. d6b7  31... c5b6 Black need not fear d5-d6 due to the check on c6, and his pieces will shortly throttle white's king. 32. b3c4  32... e7e3  33. g2h1 