I was playing the other day a Queens gambit game, but it seems that my opponent had a very good prep against players like me who play with White like:
[FEN ""] 1.d4 d5 2.c4 e6 3.Nc3 dxc4
I usually go for a setup with Nf3, e3 (my bishop is locked and I fianchetto it on b2 later in the game). My line against QGA goes like this
[FEN ""] 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. b3 7... Nc6 8. Bb2 cxd4 9. Nxd4 Bd7 10. Nf3 Be7 11. Nbd2 O-O 12. Rc1 Rc8 13. Qe2 Qa5 14. a3 Rfd8 15. b4 Qh5 16. Nb3 *
Note that my opponent tricks me into playing a QGA with my knight on c3. It really annoys me a lot. I looked at some lines like this:
[FEN ""] 1.d4 d5 2.c4 e6 3.Nc3 dxc4 4. e3 a6 5. a4 (5. Bxc4 b5 6. Be2 Bb7 7. Bf3 ( 7. Nf3 Nf6 8. O-O Nbd7 9. b3 c5 10. Bb2 Rc8 11. Rc1 Be7 12. dxc5 Bxc5 13. a4 b4 14. Nb1 O-O 15. Nbd2 Nd5 16. Nc4 Be7 ) Bxf3 8. Nxf3 Nf6 9.O-O c5) 5... Bb4 6. Bxc4 Nf6 7. Nf3 b6 8. O-O Bb7 9. Qe2 O-O 10. Bd3 c5 11. dxc5 Bxc5 12. e4 Nbd7 13. Bf4 Nh5 14. Be3
I noticed that in the 5. a4 line Black is fine and has some initiative on my kingside which I also disliked. And in the 5. Bxc4 line I feel more comfortable playing it. The 5. Bxc4 b5 6. Be2 Bb7 7. Bf3 variation is a bit dry, and the 5. Bxc4 b5 6. Be2 Bb7 7. Nf3 variation I like it more but the engine doesn't like it much!
The other option is to play 4. e4, which has a lot of theory in QGA and I also tried to avoid it by playing the other mainline in the QGA with Nf3 and e3. Playing the positions with 4.e4 are really hard imo. I tried to play e4 variation in QGA for 2 years and felt uncomfortable. I prefer to play the other system with Nf3 and e3. I would really appreciate some feedback on how to play a QGA the way that I like with Nf3 and e3 if black plays 1.d4 d5 2.c4 e6 3.Nc3 dxc4. I just don't wanna go to e4 variations unless you have a very easy reference that I can read about it. Thanks!