1. c2c4  1... g8f6  2. g1f3  2... g7g6  3. b1c3  3... f8g7  4. e2e4  4... d7d6  5. d2d4  5... e8g8  6. f1e2  6... e7e5  7. d4d5 The  Petrosian system which was successfully revived by Vladimir Kramnik. 7... a7a5  8. c1g5  8... h7h6  9. g5h4  9... b8a6  10. f3d2  10... c8d7  11. a2a3  11... d8e8  12. g2g4 One of the key points behind this positional system.  Anton wants to lock the kingside. 12... a5a4  13. f2f3  13... h6h5  14. h1g1  14... h5g4 A novelty. 15. f3g4  15... f6h7 Firouzja, on his turn, regroups his pieces on the kingside. 16. d1c2  16... a6c5  17. e1c1  17... g7h6  18. g4g5 Otherwise the bishop will come in  front of the pawns and Black will have good game. 18... e8e7 As usual  in chess you gain something in return for something else. Black forces the defensive move: 19. d2f3 Which clears the queenside knight's road to the  center after: 19... c5b3  20. c1b1  20... h6g7  21. h4f2  21... b3d4  22. c2d2 White is  happy with the status quo and does not want to open the game yet. 22... d4e2  23. d2e2  23... f7f5 The only chance of counterplay. 24. f2e3  24... f5e4 In conjunction with Black's next move this is the only  way to play the position! 25. f3d2  25... f8f4 A pet sacrifice of the prominent GM Gligoric. The KID guru clearly understood the value of his dark-squared bishop and was not shy of giving up two pawns for setting it out of his prison cell. 26. e3f4  26... e5f4  27. d2e4  27... a8e8 At the price of two pawn Black's pieces  entered the game. The bishop capture on c3 is a threat, so Anton carefully consolidates his pieces. 28. e2f2  28... e7f7  29. b1a1  29... f7f5 Whereas Firouzja uses  every move to bring his troops to better positions. 30. d1e1  30... g7e5  31. h2h4  31... f5h3  32. g1h1  32... h3d3  33. h4h5 Correctly opening files for the rooks. The  question now is what is more valuable, files or diagonals? 33... d7f5  34. h5g6  34... f5g6  35. h1h6  35... g8f7  36. f2h4 Anton misses his first winning opportunity. 36... h7f8  37. h4h1  37... e5g7  38. h6h4 This obvious attack misses the second  winning opportunity. 38... e8e4 Firouzja seizes his the chance. 39. e1e4  39... g7c3 This  is the point. Black is happy to part with the second exchange just to open the position of the enemy king. 40. h4f4 Now Anton stands on the verge of the defeat. 40... f7g8  41. b2c3  41... d3c3  42. a1a2  42... c3b3  43. a2a1  43... b3a3  44. a1b1 Here too  Black has perpetual, but he may also bring on the reserves to try and mate the opponent's king. This is what Firouzja's next move is aimed for. 44... f8d7  45. b1c2  45... d7e5 Perhaps here Firouzja noticed a nasty little detail. 46. h1h6  46... g6e4  47. f4e4  47... a3a2 Black can win the rook anytime his likes, but no longer the game. 48. c2d1  48... a2b3  49. d1c1  49... b3c3  50. c1d1  50... c3d3  51. d1c1  51... d3e4 