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1.d4 d5 2.e4 dxe4 3.Nc3 e5 4.Nxe4 · ECO D00
Blackmar-Diemer Gambit: Lemberger Countergambit, Lange Gambit is a chess opening that arises after 1.d4 d5 2.e4 dxe4 3.Nc3 e5 4.Nxe4. It is classified D00 in the ECO system, and the position after these moves has black to move.
This line is a variation within the Blackmar-Diemer Gambit family. The strategic ideas above describe the family as a whole; this particular line reaches them by the move order 1.d4 d5 2.e4 dxe4 3.Nc3 e5 4.Nxe4.