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1.d4 g6 2.Nc3 Bg7 3.e4 c5 4.d5 Qa5 · ECO B06
Pterodactyl Defense: Eastern, Benoni Pterodactyl is a chess opening that arises after 1.d4 g6 2.Nc3 Bg7 3.e4 c5 4.d5 Qa5. It is classified B06 in the ECO system, and the position after these moves has white 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.Nc3 Bg7 3.e4 c5 4.d5 Qa5.