1. Main line 1. d4 c6 2. Nf3 Nf6 3. c4 b5 Choose a line 1. Main line 1. d4 c6 2. Nf3 Nf6 3. c4 b5 Close 1. Main line 1. d4 c6 2. Nf3 Nf6 3. c4 b5 Next