Chess Opening Theory/1. d4/1...Nf6/2. c4/2...g6/3. Nc3/3...Bg7/4. e4/4...d6/5. f3/5...O-O

= King's Indian Defence =

5. ... O-O
This is the standard line. Black castles and prepares to exploit his lead in development.

Theory table
'''1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O'''