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The King's Indian Attack, The Easy Repitore Hole-Filler

Sure, you can play it against anything, but that doesn't mean it is good against anything. There's a reason it is a rare visitor to the highest levels: it offers White no tangible advantage other than as a surprise weapon the opponent might have ignored in preparation.
Again, just because White executes the moves e2-e4, Nf3, d2-d3, g2-g3, Bg2, and 0-0 does not make the opening a "King's Indian Attack." For example, in the variation you posted above, the position is a double-KP opening, irregular, it is true, but that doesn't make it a KIA.
The KIA was developed specifically to use the KID reversed when Black's moves would not be helpful to White in the KID - principally against the French and Caro-Kann Defenses, since those moves (= e3 or c3) wouldn't worry the KID. The same set-up can be played against a variety of Black defenses, but most of them fall into other opening categories, and none of them promise even the "normal" advantage for White.
Wait...
Didn't Fischer play the KIA???
Yes he did, and that means it must have some credential.
Anymore comments???

As far as I know, Fischer played the KIA against the French variation of the Sicilian Defence (2... e6). I wonder if it can be used well in correspondence chess...???

Thanks,
Fischer did use 1.b3, but transposed to the Bird's Opening. f4 and b3 is a great combination.
I think that under grandmaster level, the KIA is a great attack weapon,
Any more comments

I play the KIA and I have to say that it takes very dynamic attacking to pull it off. Just because Fischer and Kasparov used it, that doesn't mean that they used it against everything. Its a lot more difficult to transpose into the KIA from e4 than it is to start the game out with Nf3 or g3 because the setups are different. Try taking a look at some of their games and you will see how the KIA isn't a way to play against most situations that can arise after the first move e4.

The KIA just sucks b/c you don't really get your normal white advantage against it. Take a look at this-I get this comfortable position as Black many times when White tries to pull a KIA vs. Sicilian. I have many flexible plans for the middle and will probably play on the queenside w/ eventual b5 but I might even play on the kingside with an eventual f5 KID style.
Even playing (other) Anti-Sicilians is better than this.
True,
but he used them effectively
Because he was Fischer. Are you Fischer?
KIA is almost as much work as a low repretoire e4. You need to know all of blacks 6+ setups and the plans against them.

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Hey Chess Fans,
I like the opening 1.e4. Solid and dynamic, with so many options for White to choose from. But Black also has a lot of options. He has the Alekhine, Sicilian, Modern, Pirc... The list is very big. I don't have time to learn adaquate responses to all of these, and that is when I came across the King's Indian Attack. It is an easy way to get a fighting position against almost any of Black's defenses. Here is an example.