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Old Indian Defense: Aged Gibbon Gambit is a chess opening that arises after 1.d4 Nf6 2.c4 d6 3.g4. It is classified A53 in the ECO system, and the position after these moves has black to move.
This line is a variation within the Old 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.c4 d6 3.g4.