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Blackmar-Diemer Gambit Accepted is a chess opening that arises after 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3. It is classified D00 in the ECO system, and the position after these moves has white to move.
Each of these is a named opening reached by playing on from 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3. Open any of them to load the position on the board.