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1.e4 e5 2.f4 exf4 3.Nf3 Nc6 4.Nc3 g5 5.h4 g4 6.Ng5 h6 7.Nxf7 Kxf7 8.d4 · ECO C25
Vienna Gambit, with Max Lange Defense: Hamppe-Allgaier Gambit, Thorold Variation is a chess opening that arises after 1.e4 e5 2.f4 exf4 3.Nf3 Nc6 4.Nc3 g5 5.h4 g4 6.Ng5 h6 7.Nxf7 Kxf7 8.d4. 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.f4 exf4 3.Nf3 Nc6 4.Nc3 g5 5.h4 g4 6.Ng5 h6 7.Nxf7 Kxf7 8.d4.