1. g1f3  1... d7d5  2. g2g3  2... g7g6  3. d2d4  3... f8g7  4. c2c4  4... c7c6  5. f1g2  5... g8f6  6. e1g1  6... e8g8 The system with c6-d5 in the Grunfeld Fianchetto has been played in thousands of games, even at the world championship level. It's one of Black's most solid options. 7. f1e1 A big surprise. I've never seen this move before. Can you imagine this is only the 15th most-popular move in the position $2 It was played by a GM just twice before, both times in blitz games. So it's safe to say that this is nearly a new idea. 7... d5c4 A principled reaction, played after a long reflection. One feature of Ding's style is that he's not afraid to go for complicated and forcing variations, even when he might face advanced preparation. 8. e2e4 Officially a new move. This is obviously White's idea 7.Re1. 8... c8g4 A good reaction, pinning the knight and exerting pressure on the center. 9. b1d2 The first choice of the computer. Gukesh was still following his preparation. The knight attacks c4 and also prepares to capture on f3. 9... c6c5 A surprising move, probably played in order to take Gukesh out of his preparation. 10. d4d5  10... e7e6  11. h2h3 White had a difficult choice at this point. This move is very natural, but capturing on c4 might be even more accurate. 11... g4f3  12. g2f3 The best capture. 12... e6d5  13. e4d5  13... b8d7  14. d2c4  14... b7b5 Removing the knight from its excellent post. 15. c4a3 A good retreat. 15... d8b6  16. c1f4  16... f8e8 This type of position is sometimes seen in the Grunfeld Defense. White has the pair of bishops and a strong passed pawn, but Black is not without chances with a queenside pawn majority and the idea of blockading the pawn with Ne8-d6 or attacking it with Rad8. 17. d1d2  17... a8d8  18. a3c2 Both sides play natural moves. The knight returns to a better position. 18... d7f8 Preparing to attack the d5-pawn and maybe play Nf8-e6, exploiting the pin. There are alternatives. 19. b2b4 An interesting decision. By breaking the queenside, White gains important squares for the knight. 19... c5c4 White gets the d4-square for the knight, but the passed pawn on c4 gives Black reasonable chances. 20. f4e3 