King's Indian Defense: Fianchetto Variation, Yugoslav Variation, Advance Line

The King's Indian Defense: Fianchetto Variation, Yugoslav Variation, Advance Line is a chess opening classified under ECO code E66 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 8 moves: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 d6 6. O-O c5 7. Nc3 Nc6 8. d5. The resulting position leaves black to move.