Best response to the King's Indian Defense: Fianchetto Variation, Classical Fianchetto (E67)

1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 d6 6. O-O Nbd7 7. Nc3 e5 · White to move

What is the best response to the King's Indian Defense: Fianchetto Variation, Classical Fianchetto (1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 d6 6. O-O Nbd7 7. Nc3 e5)? White to move. See the top replies ranked by opening theory and real-game results, starting with b3.

The main theoretical reply is b3, reaching the King's Indian Defense: Fianchetto Variation, Double Fianchetto Attack.