A logical move, preparing the development of the knight on a3, but it's not clear how White will react when Black plays a7-a6. It seems to me that both players confused the move order in the opening, which is not surprising; after all, this is a blitz game.
1. e2e4  1... e7e6  2. d2d4  2... d7d5  3. e4e5  3... c7c5  4. c2c3  4... b8c6  5. g1f3  5... c8d7  6. f1e2  6... f7f6 This is one of the sharpest variations of the French advance, leading to positions with many tactical complications. 7. e1g1  7... f6e5  8. f3e5  8... c6e5  9. d4e5  9... d8c7  10. c1f4 The fourth most popular move. Nepomniachtchi, as do all elite players, has his own views on opening theory. 10... g8e7 