A cool  move! It had already been played in a game which apparently was not  overlooked by the world champion.
1. g1f3  1... c7c5  2. e2e4  2... d7d6  3. f1b5  3... c8d7 This is considered the safest continuation against the Moscow variation. 4. b5d7  4... b8d7  5. e1g1  5... g8f6  6. f1e1  6... a8c8  7. c2c3  7... e7e6  8. d2d4  8... c5d4  9. c3d4  9... d6d5 Modifying the structure to a French one.  In return for the tempo wasted on d7-d6-d5, Black can brag about swapping  his poor light-squared bishop. 10. e4e5  10... f6e4  11. b1d2  11... e4d2 