After somewhat weakening the enemy kingside,  Firouzja fianchettoes his bishop.
1. d2d4  1... g8f6  2. g1f3  2... d7d5  3. e2e3  3... e7e6  4. b1d2  4... c7c5  5. b2b3  5... f8d6  6. c1b2  6... e8g8  7. f1d3  7... b8c6  8. e1g1  8... d8c7  9. c2c4  9... c5d4  10. e3d4  10... c8d7  11. f1e1  11... f8d8  12. c4c5 That is the thing, Aronian seizes loads of space on the queenside.  12... d6f4 Black is trying to keep his bishop as active as he can. 13. g2g3  13... f4h6  14. a2a3 