"A big mistake"  according to Artemiev. "It is not a good square (for the pawn) in the  endgame."
1. g1f3  1... d7d5  2. e2e3  2... g8f6  3. c2c4  3... e7e6  4. b1c3  4... d5c4  5. f1c4  5... a7a6  6. e1g1  6... b7b5  7. c4e2  7... c8b7  8. a2a4 Technically speaking, a  novelty. However, White plays this move sooner or later, therefore, it  should come as a surprise for Black. Still, there is an important  difference in comparison to the usual lines. 8... b5b4  9. c3b1  9... c7c5  10. d2d3  10... b8c6  11. b1d2  11... f8e7  12. e3e4 