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. 10. d4e5  10... f6g8 Black loses a couple of tempi, but it might be worth it as long as the knight manages to comfortably attack the key e5-pawn. 11. h2h4 Aggressive prophylaxis. 11... a8c8 