This set-up arises after 1.d4 Nf6 2.c4 g6 (ECO E60). Black plans to fianchetto the bishop on g7 - and from here the roads fork into two great defences: the King's Indian (with ...d6 and ...e5) and the Grunfeld (with an early ...d5).
The early ...g6 is extremely flexible in itself: Black is not yet showing which scheme will follow and adapts to White's set-up. The bishop on g7 is aimed at the centre along the long diagonal.
This is the crossroads of the Indian defences. Understanding the starting position here helps you find your bearings in several popular Black openings against 1.d4 at once.
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