Pterodactyl Defense: Eastern, Benoni

The Pterodactyl Defense: Eastern, Benoni is a chess opening classified under ECO code B06 in the Semi-Open Games family, where Black responds to 1.e4 with something other than 1...e5, including the Sicilian Defense, Caro-Kann, and Pirc. It is reached after 4 moves: 1. d4 g6 2. e4 Bg7 3. Nc3 c5 4. d5. The resulting position leaves black to move.