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Blackmar-Diemer Gambit: Zeller Defense is a chess opening that arises after 1.d4 d5 2.e4 dxe4 3.Nc3 Bf5. It is classified D00 in the ECO system, and the position after these moves has white 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 Bf5.
Each of these is a named opening reached by playing on from 1.d4 d5 2.e4 dxe4 3.Nc3 Bf5. Open any of them to load the position on the board.