1. e2e4  1... c7c5  2. g1f3  2... d7d6  3. d2d4  3... c5d4  4. f3d4  4... g8f6  5. b1c3  5... a7a6  6. h1g1 This seemingly primitive move, with the unmistakable intention of advancing the pawn to g4, has become a dangerous weapon in the hands of many grandmasters. It makes sense; after all, why worry about not being able to short-castle if White wants to take the king to the other side $2 6... h7h5 A radical way of preventing the advance. 7. f1c4 I almost couldn't believe it when I searched my database and didn't find another game with this move. A theoretical novelty in the seventh move of the Najdorf Defense $2 This is amazing. 7... g7g6 [%c_effect g6;square;g6;type;Interesting;persistent;true] The opening becomes more and more interesting. Black chooses the typical Dragon development instead of playing the natural e7-e6. 8. c1g5  8... f8g7  9. d1d2 White prepares to castle kingside. 9... d8a5  10. e1c1  10... b8c6  11. d4b3 This is enough for a small advantage in a position without queens. 11... a5g5 [%c_effect g5;square;g5;type;GreatFind;persistent;true] The only justification for Black's previous play. 12. d2g5  12... g7h6  13. h2h4  13... c8e6 [%c_effect e6;square;e6;type;Mistake;persistent;true] This is a tactical oversight. 14. c4e2 [%c_effect e2;square;e2;type;Mistake;persistent;true] Missing the refutation. It's important to note that it's clear that Caruana is not in his best form in this tournament, and even so, he is fighting for first place. On his best days, he surely would find the correct sequence. 14... e8f8 Firouzja continues his dangerous strategy of not rushing to take the queen. 15. b3d4  15... c6d4  16. d1d4  16... a8c8  17. f2f4  17... h6g5 Finally. 18. h4g5  18... f6g4 The endgame is more pleasant for White since he has more space and mobile pawns on e4 and f4. 19. g1f1 