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manderson: Technically this isn't the Cambridge Springs. The Cambridge Springs is classified under D52 (after 5.e3 c6 6.Nf3, and then 6...Qa5). D51 is the QGD:Semi-Pillsbury, variants with 4...Nbd7, but not 5.e3 c6 6.Nf3. It includes several sub-variants such as: Alekhine:
5.Nf3 c6 6.e4
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