context: 1. d2d4  1... d7d5  2. c2c4  2... e7e6  3. b1c3  3... c7c5  4. c4d5  4... e6d5  5. g1f3  5... b8c6  6. g2g3  6... g8f6  7. f1g2  7... c5d4  8. f3d4  8... f8c5 Firouzja played this line in an important tournament this year. It's clear that Nepomniachtchi was expecting it, and he came armed with some fine preparation. 9. d4b3  9... c5b6  10. c3d5  10... c8e6  11. d5b6  11... d8d1 