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.