I don't think there is anything in particular wrong with 5. Bg5. Ivan Sokolov has been playing this variation with white. Actually black's most common reply is 5... 0-0 when white could just transpose to Averbakh variation with 6. Be2 but it's also possible to play 6. Qd2!?. Maybe in the past it was thought that 5. Bg5 is inaccurate because black can chase the bishop begining with 5... h6 but although playable this continuation also leads to certain weaknesses that white can try to use.
Hi chess community!
I have started playing the Kings Indian and wonder what the most trying line is against the Smyslov system (5.Bg5)? I figure there must be a good reason why it is not the most common of white's moves.
Thank you.