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Rat Defense: Small Center Defense is a chess opening that arises after 1.d4 e6 2.e4 d6. It is classified C00 in the ECO system, and the position after these moves has white to move.
This line is a variation within the Rat Defense family. The strategic ideas above describe the family as a whole; this particular line reaches them by the move order 1.d4 e6 2.e4 d6.