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Rat Defense: English Rat, Lisbon Gambit is a chess opening that arises after 1.d4 d6 2.c4 e5 3.dxe5 Nc6. It is classified A41 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 d6 2.c4 e5 3.dxe5 Nc6.