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When to use a fianchetto ?

In which positions is it often useful to play a fianchetto? With which pawn structures? Why ?

When is it bad to play a fianchetto?

Thank you for your answers.
Fiachetto is just one way to develop the bishop. Your question could also be asked, 'When is it best to play Bg5?'.

I don't think I need to answer ... you must have understood already ...
A fianchetto generally goes with the opening you choose. Just play openings which feature a fianchetto and play the opening many many times. Along the way you will discover the ins and outs of the fianchetto. The move is a normal part of chess play and you must play it, to learn all the aspects of chess. You must have some experience playing against opponents who do fianchetto and considering your rating, I'm surprised that you aren't more familiar with it. You can use the experience of those games to help you when you do. :]
As will_is_myth stated, fianchetto is a way to develop your bishop, so basically depends on your taste for certain positions, the long range of the bishop on the big diagonal often has multifunctional purpose, like: set up a battery with the queen to aim at one or another flank of the board, make a strong fortress on your castled position that is flexible as much in defense and attack, support the protection of certain pieces covered in its diagonal, must mainly to influence the central squares that belong to its range of activity, the pawn structures that fit this concept are variable according to what your opponent plays so that's pretty much an individual preference to choose the fianchetto development or not, just like Bg5 may or not be played according to your strategy as commented previously; however sometimes the position asks you to develop your bishop in a certain way like when too many pawns are in the same squares as any of your bishops and it's difficult to develop such piece, then playing a fianchetto styled position is logically justified, here are some reference games that you can check for expanding this concept: http://www.chessgames.com/perl/chessgame?gid=1044281 [Fischer using his fianchetto bishop to open a central file for his rook] --- http://www.chessgames.com/perl/chessgame?gid=1069963 [Kasparov neutralizing an opponent's fianchettoed bishop with a fianchetto of his own] --- http://www.chessgames.com/perl/chessgame?gid=1924138 [Kramnik wins a pawn with his fianchetto bishop to set preponderant activity for his pieces on central squares] --- And some more criteria on the use of the fianchetto www.suffernchessclub.com/what-is-fianchetto-how-use/ I hope this provides some light on your question, have a good day
You fianchetto when you believe that diagonal puts the most pressure on your opponent. That diagonal is often very valuable but if your opponent can make a pawn formation that makes it so your bishop is biting on granite and you have no way of softening up that pawn formation then the fianchettoed bishop is going to get little value. you can generalize that for putting a piece on any square. From that square does it apply pressure, does it control valuable squares. so even if your fianchettoed bishop isn't biting on granite it can still be useless if it is also biting on thin air if control of those squares doesn't benefit you or hurt your opponent then the fianchettoed bishop is misplaced
Fianchetto = latent power, the basis for dynamism

It takes you a lifetime to know, but you can simply fianchetto always and everywhere. Reti „invented“ the double-fianchetto, why not?

if you make double fianchetto dont u usually give center to opponent? may require delicate handling of the situation
The fianchetto can be an effective tool in defending against a pawn storm.

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