1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g1f3  3... d7d5  4. b1c3  4... c7c5  5. e2e3  5... b8c6  6. a2a3 This line yielded an important victory for Ding, with White, against Nakamura in the Candidates Tournament. 6... d5c4  7. f1c4  7... a7a6  8. c4a2 A rare retreat. 8... b7b5  9. d1c2 [%c_effect c2;square;c2;type;Interesting;persistent;true] A fresh idea. Firouzja had played this before, but apparently the world champion was not well prepared for it. 9... c5d4  10. e3d4  10... c8b7  11. d4d5 [%c_effect d5;square;d5;type;GreatFind;persistent;true] 11... e6d5  12. c1g5 A new move. 12... f8e7  13. a1d1  13... d5d4 [%c_effect d4;square;d4;type;Inaccuracy;persistent;true] This move leads to a dangerous position. Black wastes precious time and opens the diagonal of the dangerous bishop on a2. The correct way to defend involves the maneuver Na5-c4. 14. e1g1  14... e8g8  15. f1e1 All of White's pieces are playing, and Black needs to find an almost impossible move to minimize the damage. 15... b5b4 I considered putting a dubious sign on this move, but considering the difficulty of the correct one, I thought that would be unfair. 16. a2b1 [%c_effect b1;square;b1;type;Inaccuracy;persistent;true] Once again it is difficult to place a dubious sign, but this time it's necessary. 16... g7g6 The only way to defend. 17. e1e7 [%c_effect e7;square;e7;type;GreatFind;persistent;true] Justifying the previous move.