King's Indian Defense: Fianchetto Variation, Pterodactyl Variation

The King's Indian Defense: Fianchetto Variation, Pterodactyl Variation is a chess opening classified under ECO code E64 in the Indian Defences family, where Black responds to 1.d4 with 1...Nf6, including the Nimzo-Indian, Queen's Indian, and King's Indian. It is reached after 5 moves: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 c5 5. Bg2 Qa5+. The resulting position leaves white to move.