1. Main line 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 c5 Choose a line 1. Main line 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 c5 2. Main line, 6... c5 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. e3 d5 6. Nf3 c5 3. Steiner Variation 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 c5 5. dxc5 Bxc3+ Close 1. Main line 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 c5 2. Main line, 6... c5 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. e3 d5 6. Nf3 c5 3. Steiner Variation 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 c5 5. dxc5 Bxc3+ Next