1. Main line 1. d4 Nf6 2. Nf3 g6 3. Bg5 Choose a line 1. Main line 1. d4 Nf6 2. Nf3 g6 3. Bg5 2. Euwe Variation 1. d4 Nf6 2. Nf3 g6 3. Bg5 Bg7 4. Nbd2 c5 Close 1. Main line 1. d4 Nf6 2. Nf3 g6 3. Bg5 2. Euwe Variation 1. d4 Nf6 2. Nf3 g6 3. Bg5 Bg7 4. Nbd2 c5 Next