1. c2c4  1... e7e6  2. g2g3  2... d7d5  3. f1g2  3... g8f6  4. g1f3  4... d5d4  5. e1g1  5... b8c6  6. d2d3  6... f8c5 A popular line among the elite nowadays. Nepomniachtchi was knocked out of the World Cup by Vidit in this variation. 7. b1d2  7... e8g8  8. d2b3  8... c5e7  9. e2e3  9... d4e3  10. c1e3  10... a7a5  11. h2h3 A useful move, preventing ...Ng4. 11... a5a4  12. b3d4  12... c6d4 