What to Do Against Bishop G5 in King's Indian Defense?

I'll sometimes see opponents (in my sub-1200 games) start against an attempted King's Indian Defense with Bishop G5 on MOVE #2.  On MOVE #3, they take the Knight on F6 (regardless of what I do) sort of messing up my kingside structure.  Curious if there is a best response to Bishop G5?

Hi, Fiveofswords

I'll have to perhaps try to look some more, but my first search of London System did not turn up a position like this one.  

Having said that, I'm still wondering what might be BLACK's best play here.    I guess it's not so much the name of the position that worries me, but more like how best to respond.  I find double pawns like that a pain.  ...Will try to find more info. when I can, but people feel free to post your ideas.  Thanks! 

2. ... Ne4, or ... e6, or ... d5, or ... c5 are all fully playable. 2. ... g6 is not as good, but doesn't lose out of hand either.

Unusual move orders!

1.d4 Nf6 2.Bg5 is the Trompowski, or Ruth Attack.

It was little respected, until Michael Adams showed how deadly it can be in the early 90's.

Ne4 is the main line, c5 is a little sharp, e6 is solid.

I've played e6, since after 3. e4 h6!, white has to give up his bishop pair or a pawn (4. Bh4?! g5! and Nxe4), so while white will get a development advantage and some control of the centre, the black dark-squared bishop will be strong later on.

Think not seen so much top levels because 2...d5 3BxN gxf6 followed by c5,  the two bishops pretty much ensure equality. Other options on move 3 don't acheive much.

2014 thread!

2016 Answer

https://www.chessgames.com/perl/chessgame?gid=1847603