QGA with the Simple 7.b3: Queen's Gambit line

Queen's Gambit line, 12 moves deep. You play White.

1. d4
2. d5
3. c4
4. dxc4
5. Nf3
6. Nf6
7. e3
8. e6
9. Bxc4
10. c5
11. O-O
12. a6
13. b3
14. b5
15. Be2
16. Bb7
17. Bb2
18. Nbd7
19. a4
20. b4
21. Nbd2
22. cxd4
23. Nxd4