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Blackmar-Diemer Gambit is a chess opening that arises after 1.d4 d5 2.e4. It is classified D00 in the ECO system, and the position after these moves has black to move.
This position can also be reached by another move order, including 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6.
Each of these is a named opening reached by playing on from 1.d4 d5 2.e4. Open any of them to load the position on the board.