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  12... a6a5 "A big mistake"  according to Artemiev. "It is not a good square (for the pawn) in the  endgame." 13. d2b3 This is the difference. The b3 spot is available  for the knight and Artemiev can put a lot of pressure against the a5 and  c5 pawns. 13... c5c4 Vitiugov decided to solve the problem of the backward pawn  at once, but this creates other issues. "Risky" said Artemiev. 14. d3c4  14... f6e4  15. d1d8 