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1.d4 Nf6 2.g4 Nxg4 3.e4 d6 4.Be2 Nf6 5.Nc3 · ECO A45
Indian Defense: Gibbins-Weidenhagen Gambit, Stummer Gambit is a chess opening that arises after 1.d4 Nf6 2.g4 Nxg4 3.e4 d6 4.Be2 Nf6 5.Nc3. It is classified A45 in the ECO system, and the position after these moves has black to move.
This line is a variation within the Indian Defense family. The strategic ideas above describe the family as a whole; this particular line reaches them by the move order 1.d4 Nf6 2.g4 Nxg4 3.e4 d6 4.Be2 Nf6 5.Nc3.