Nowadays, this is the main line, surpassing 9.Bc4 in popularity.
1. e2e4  1... c7c5  2. g1f3  2... d7d6  3. d2d4  3... c5d4  4. f3d4  4... g8f6  5. b1c3  5... g7g6 The Dragon is a rare guest at elite tournaments, but it's always fun to see it in action. 6. c1e3  6... f8g7  7. f2f3  7... e8g8  8. d1d2  8... b8c6 