1. Main line 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qb3 Choose a line 1. Main line 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qb3 Close 1. Main line 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qb3 Next