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Vienna Gambit, with Max Lange Defense is a chess opening that arises after 1.e4 e5 2.Nc3 Nc6 3.f4. It is classified C25 in the ECO system, and the position after these moves has black to move.
Each of these is a named opening reached by playing on from 1.e4 e5 2.Nc3 Nc6 3.f4. Open any of them to load the position on the board.