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1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3 · ECO C25
Vienna Gambit, with Max Lange Defense: Knight Variation is a chess opening that arises after 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3. It is classified C25 in the ECO system, and the position after these moves has black to move.
This line is a variation within the Vienna Gambit, with Max Lange Defense family. The strategic ideas above describe the family as a whole; this particular line reaches them by the move order 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3.
Each of these is a named opening reached by playing on from 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3. Open any of them to load the position on the board.