2...Bf5 3.c4 dxc4 4.e3 b5: London System line

London System line, 7 moves deep. You play White.

1. d4
2. d5
3. Bf4
4. Bf5
5. c4
6. dxc4
7. e3
8. b5
9. a4
10. c6
11. axb5
12. cxb5
13. b3