Firouzja enters the Chigorin system  down a tempo. In comparison to the main lines, White does not have his  rook on e1.
1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... a7a6  4. b5a4  4... g8f6  5. e1g1  5... f8e7  6. d2d3  6... b7b5  7. a4b3  7... d7d6  8. c2c3  8... e8g8  9. h2h3  9... c6a5  10. b3c2  10... c7c5 