1. Main line

1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4

2. Queen's Gambit Accepted: Normal Variation

1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3

3. Queen's Gambit Accepted: Smyslov Variation

1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 g6

4. Queen's Gambit Accepted: Winawer Defense

1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Be6