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1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3 g5 5.h4 g4 6.Ng5 d6 · ECO C25
Vienna Gambit, with Max Lange Defense: Hamppe-Allgaier Gambit, Alapin Variation is a chess opening that arises after 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3 g5 5.h4 g4 6.Ng5 d6. It is classified C25 in the ECO system, and the position after these moves has white 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 g5 5.h4 g4 6.Ng5 d6.