Does anyone here use the King's Indian Defence , fianchetto variation? Is it a strong opening?

sometimes. It's good.

Here is a game with the basic strategies of the King's Indian:

Wow thanks for the game, the reason why I like the King's Indian is because of the strong grip on the center squares, but I was wondering if the King's Indian has any flaws or weakness.

Two Weaknesses. The B on c8, and the B on g7. If you can make them strong you have a good position.

I play the Reti/KIA as white, the Pirc (KID with 1. d3 so they can't push e5 to take the knight) as black versus 1. e4, and the KID versus everything else.

Weaknesses:

The kings bishop is relegated to a defensive role until you get your opponents queens bishop, and possibly his queen, off of the board.  Essentially, you have to learn to play with one piece down for the early middle game.  This is not so much a big deal as these openings lead to very quiet positions until the position has opened up.

While you have strong king safety, the pawn structure (dark squares) in front of your king is weakened.

The way to beat these openings is this:  Castle queenside, and cripple the kingside defenses with a pawn storm.

Here is a good game that I just finished that demonstrates the strategy to beat it  (this game is actually a Pirc but the same strategy is for both).  He crippled my defences early on and forced me to play risky chess.  My opponent had great play here, in fact I was one move away from a forced mating sequence when he got me:

http://www.chess.com/echess/game.html?id=9318989  (I can't get the diagram poster to load for some reason, will edit later when it works.)

I always use if I can!!!

no, white is supposed to attack on the queenside, since he normally has a pawn on d5.

It's too theoretical and if both players are theoretically well-prepeared it's just a DRAW. That's why i prefer Modern Benoni.

so is there any way to comeback if  the opponent castle queenside, and cripples the kingside defenses with a pawn storm? Also is there opening for white that has great offence and defence, and has a good grip on the center squares?

I love playing the KID. I've done well with it, but I think  that black has to keep up the pressure, it seems to favor the attacking player.

Yes you just have to outplay them :) and watch out for h4 and play accordingly.  The KID is all about the comeback...the strategy is to counterattack after your opponents attack has overextended their resources.

Probably should listen to this guy...I'm pretty new and just playing this based off literature and all of my experience with opponents <1600. 

I didn't mean to imply that most of the piece play happens on the king side -- merely that white uses their g and h pawns to disrupt blacks defenses.  Definitely the action is on the queenside (maybe the above game is actually a bad example of that).

I like it too, but it is not easy to learn. A nice book to read is "starting out - the kings indian defense" from everyman chess.

I often play the pirc as there are not that many players starting with d4 and there white often do not get his pawn to c4 before the knight blocks it on c3. In this case at least is the queenside black's and the kingside white's territory. I suppose that with a pawn on c4 it is the other way around.

mvh Fredrik

What are you talking about? What high-theoretical line in the king's indian defence has drawish tendencies?