context: 1. b1c3  1... g8f6  2. d2d4  2... d7d5  3. c1f4 Firouzja's bread-and-butter line. 3... c7c5  4. e2e3  4... c5d4  5. e3d4  5... a7a6  6. g1f3  6... b8c6  7. f3e5  7... e7e6  8. g2g3  8... c8d7  9. f1g2  9... c6e5 This line has picked up of late.