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English Defense: Perrin Variation is a chess opening that arises after 1.d4 e6 2.c4 b6 3.e4 Bb7 4.Bd3 Nc6. It is classified A40 in the ECO system, and the position after these moves has white to move.
This line is a variation within the English 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.c4 b6 3.e4 Bb7 4.Bd3 Nc6.