1. Main line
1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4
1. Main line
1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4
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Preview: 3 of 4 lines
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