1. d2d4  1... d7d5  2. c2c4  2... e7e6  3. g1f3  3... g8f6  4. g2g3  4... f8e7  5. f1g2  5... e8g8  6. e1g1  6... d5c4  7. d1a4 7.Qc2 is the most popular move. The idea of the move played is to avoid 7...b5. 7... a7a6 The downside is that now White cannot play 8.a4, an option that is possible when the queen is on c2. 8. a4c4 