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Pterodactyl Defense: Eastern, Benoni is a chess opening that arises after 1.d4 g6 2.e4 Bg7 3.Nc3 c5 4.d5. It is classified B06 in the ECO system, and the position after these moves has black to move.
This line is a variation within the Pterodactyl Defense family. The strategic ideas above describe the family as a whole; this particular line reaches them by the move order 1.d4 g6 2.e4 Bg7 3.Nc3 c5 4.d5.