Blackmar-Diemer Gambit: Lemberger Countergambit, Lange Gambit

1.d4 d5 2.e4 dxe4 3.Nc3 e5 4.Nxe4

ECO D00

The Blackmar-Diemer Gambit: Lemberger Countergambit, Lange Gambit is a chess opening line in the Blackmar-Diemer Gambit complex, reached after 1.d4 d5 2.e4 dxe4 3.Nc3 e5 4.Nxe4.

It is catalogued under code D00 in the Encyclopaedia of Chess Openings (ECO).

The defining move Nxe4 is chosen by White on move 4.

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