1. Main line 1. d4 d5 2. c4 dxc4 3. Nf3 a6 Choose a line 1. Main line 1. d4 d5 2. c4 dxc4 3. Nf3 a6 2. Alatortsev Variation 1. d4 d5 2. c4 dxc4 3. Nf3 a6 4. e3 Bg4 5. Bxc4 e6 6. d5 3. Haberditz Variation 1. d4 d5 2. c4 dxc4 3. Nf3 a6 4. e3 b5 Close 1. Main line 1. d4 d5 2. c4 dxc4 3. Nf3 a6 2. Alatortsev Variation 1. d4 d5 2. c4 dxc4 3. Nf3 a6 4. e3 Bg4 5. Bxc4 e6 6. d5 3. Haberditz Variation 1. d4 d5 2. c4 dxc4 3. Nf3 a6 4. e3 b5 Next