The bishop is well placed on b3, protecting the king from the dangers on the b-file.
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  9. e1c1 Nowadays, this is the main line, surpassing 9.Bc4 in popularity. 9... d6d5  10. e4d5  10... f6d5  11. d4c6  11... b7c6  12. e3d4  12... e7e5  13. d4c5  13... c8e6  14. c3e4 All this is standard opening theory. 14... f8e8  15. f1c4  15... d8c7 