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 