1. Main line 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Choose a line 1. Main line 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Close 1. Main line 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Next