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.