1. Main line
1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. e3
1. Main line
1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. e3
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