This isn't Grunfeld, but if you hate the London, then play 3... c5
how to play Grunfeld against the London system?

This isn't Grunfeld, but if you hate the London, then play 3... c5
I tried to make the Grunfeld defense against White's London, I was playing Black

This isn't Grunfeld, but if you hate the London, then play 3... c5
I play black and make Nf6,d5,g6,Bg7, 0-0, always with the idea of making c5 at some point!, but it has to be done at the right time and the moves depend on the opponent, as Bf5 I don't always play

after the exchange of Bg7, everything became more difficult, as it is the main weapon of this defense.

Asking how to play a Grunfeld against the London is like asking how to play the Najdorf against 1. c4. It doesn't work that way. Pawn structures are different, piece placement is different, ideas are different.

Asking how to play a Grunfeld against the London is like asking how to play the Najdorf against 1. c4. It doesn't work that way. Pawn structures are different, piece placement is different, ideas are different.
no! the Grunfeld defense is against d4 and even c4, so there's a way to play grunfeld against London, and you confuse it after 1 c4, you don't play Narjdorf because it's an opening with white, in this case you can play the Sicilian defense that is symmetrical. Your comment doesn't make any sense, but thanks!

Asking how to play a Grunfeld against the London is like asking how to play the Najdorf against 1. c4. It doesn't work that way. Pawn structures are different, piece placement is different, ideas are different.
no! the Grunfeld defense is against d4 and even c4, so there's a way to play grunfeld against London, and you confuse it after 1 c4, you don't play Narjdorf because it's an opening with white, in this case you can play the Sicilian defense that is symmetrical. Your comment doesn't make any sense, but thanks!
It did make sense, you just didn’t understand it.

Asking how to play a Grunfeld against the London is like asking how to play the Najdorf against 1. c4. It doesn't work that way. Pawn structures are different, piece placement is different, ideas are different.
no! the Grunfeld defense is against d4 and even c4, so there's a way to play grunfeld against London, and you confuse it after 1 c4, you don't play Narjdorf because it's an opening with white, in this case you can play the Sicilian defense that is symmetrical. Your comment doesn't make any sense, but thanks!
It did make sense, you just didn’t understand it.
That's not what Bobby Fischer said, you must know more than him then, right?

It's not the Grunfeld in that the Grunfeld occurs after white has pawns on d4 and c4 and a knight on c3. However, the c5 pawn move by black that others have mentioned is a common Grunfeld move with ideas to break white's center and is very relevant in beating the London

It's not the Grunfeld in that the Grunfeld occurs after white has pawns on d4 and c4 and a knight on c3. However, the c5 pawn move by black that others have mentioned is a common Grunfeld move with ideas to break white's center and is very relevant in beating the London
Congratulations for your comment! Perfect your observation giving a class at CM , so I have to focus more on defense ideas and less on common moves, like Bg7 and Bf5. Thank you and it helped a lot!

One idea to prevent white from taking your fianchettoed bishop would be to delay that until after white plays e3. Something like this maybe:

how to play Grunfeld against the London system?
In this match I tried to play grunfeld against the damn "London system" I hate the "London System"
Black is doing well in your line except that 6.....Re8 is a doubious move.
Stockfish will almost always suggest "c5" break sooner or later. This suggestion come from No 1 best player you can trust.!!
So, the best counter against London is "c5" break.

how to play Grunfeld against the London system?
In this match I tried to play grunfeld against the damn "London system" I hate the "London System"
Black is doing well in your line except that 6.....Re8 is a doubious move.
Stockfish will almost always suggest "c5" break sooner or later. This suggestion come from No 1 best player you can trust.!!
So, the best counter against London is "c5" break.
"Cod almost always suggests a "c5" break sooner or later. This suggestion comes from the #1 best player you can trust.!!"
sorry but you are wrong. Recently Letter Zero played against this "best player", sacrificed an entire bishop and "humiliated" the other engine.
The engine serves as a reference, but it is not always completely right, even because it is programmed to make the best move from beginning to end, how to explain this defeat below? the lack of development of the "best player in the world"?, he, like us, has a lot to evolve !!!
see :

I've actually been looking into building a Grunfeld/KID repertoire in the near future. With that in mind, maybe Boris Avrukh's (a leading Grunfeld theorist) recommendations against the London would be useful. https://www.modern-chess.com/chess-databases/database=197&theme=1#article

I’ve heard, possibly, that playing the London against the London is good. May have been on YouTube with that GM with the big nose. Or I may have dreamt it, anything can happen when I take the green vitamin capsules. Also I’m not a very good chess player, so be gentle with me x

I’ve heard, possibly, that playing the London against the London is good. May have been on YouTube with that GM with the big nose. Or I may have dreamt it, anything can happen when I take the green vitamin capsules. Also I’m not a very good chess player, so be gentle with me x
thanks !!!

It's always been a system used by white and black. I noticed that black playing a London was referred to as a reversed London but it's arguable that the reversed London is the London played by white. That's because it's primarily a defensive system, which was commonly played by the black side.
reminds me of the Sicilian defense with Black and the English opening with White.
I don't know which defense is more appropriate to fight the "London system" ?

It's always been a system used by white and black. I noticed that black playing a London was referred to as a reversed London but it's arguable that the reversed London is the London played by white. That's because it's primarily a defensive system, which was commonly played by the black side.
reminds me of the Sicilian defense with Black and the English opening with White.
I don't know which defense is more appropriate to fight the "London system" ?
Well, don't get confused, If you are a Grunfeld player, then Grunfeld system is perfectly playable against London System. It's just that you have to study a bit of theory and you will be fine.
yes, i know.sorry. i am Teacher Math Here in Brazil and Job Matematic, music and chess in Scool
and sorry my English is bad
how to play Grunfeld against the London system?
In this match I tried to play grunfeld against the damn "London system" I hate the "London System"
LINK : https://www.chess.com/analysis/game/live/36367200841