1. Main line 1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 d5 Choose a line 1. Main line 1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 d5 Close 1. Main line 1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 d5 Next