1. Main line 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 Choose a line 1. Main line 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 Close 1. Main line 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 Next