How can you punish a double fianchetto?

It is not bad at all.  It is actually quite decent and very good in blitz/bullet.  Hikaru employs it quite often.

Wrong.  The double fianchetto as white is actually a very decent blitz opening.  Hikaru has played it in serious online tournaments against strong opposition like Magnus Carlsen, MVL etc.  Check it with an engine.  It is quite decent.  As I said in my original response however, it is more suited for fast time controls as there are definitely better openings out there.

King's Indian attack and Nimzo-Larsen attack lead quite often to Double Fianchetto.

I play double fianchetto alot in the sicilian.

Umm, bro I don't mean to be rude to you, but take a look at my rating.  I am 2300 in blitz and even higher in bullet.  I have played the double fianchetto as white against a variety of different black setups and it is a very decent way for white to play in blitz and even better in bullet.  It can lead to very complex positions.  But yes double fianchettos can occur in a variety of situations, like say when black plays the hippo defense etc. I am specifically talking about when white begins with fianchettos on both sides.

Having a locked center is good way to make the finachettoed bishops look dumb.

A lot depends on the pawns. Some double fianchetto openings are theory, played by GMs. It depends on the move order.

And yes, hippo-like positions are very complex, both tactically and positionally. Sometimes beginners will play a hippo to feel safe for the first ~10 moves, but in reality it's a very demanding setup... more or less it's something only beginners and GMs play... don't play it thinking it will be easy, and when you're a beginner playing against it, don't think you can punish it in 20 moves or less.

The hippo was played twice at the world chess championship match level... twice in the same match.

Sure it's a meme opening, but it's not fundamentally bad... but look at the games, they're very complex so despite appearances it's not a good opening for beginners.

And as I said before, there are at least a few double finchetto setups that are theory.

That's okay...players in the 1800s didn't understand hypermodern openings either.

If you are unfamiliar with hypermodern principles, you should heed this man's advice.  After all you wouldn't want to play some hypermodern trash like the King's Indian and be a passive player like Kasparov...

My ratio in BLITZ as white is: 53% wins, 41% losses, and 6% draws.  My ratio in Blitz as Black is 54% wins, 39% losses, 7% draws.  

Overall, I have a win loss draw ratio of 53% wins/40% losses/7% draws.  

Considering I am playing people more or less around my level, I would say that is damn good.  

As white, I win wayyy more than I lose.  As black, I win wayy more than I lose.  Yes, I seem to have equal stats as white and black, but that has to do with my style.  As white, I go for more solid play, rather than really trying to hammer my initiative.  Also, many players seem to play really well as black.  I don't want to brag, but I play very well as black and hence, I have equal stats.   

As for time controls, 3 minutes is the most popular format for strong players.  Strong players don't play much else besides 3 minute and 1 minute.

Make it a triple or a quadruple. If you can't beat them, join them. 

Maxime didn't do So well but then things got grave... 

Are you saying that a strong player can't have my win/loss ratios??? Because there are actually quite a few notable strong players who have had similar experiences.  Petrosian (famous counter attacker) and Jan Timman are excellent examples.  My win/loss ratios show that I win most games I play as white, but I am also just as likely to win as black, which as I wrote means I am just apparently really good as black for some reason.

Or are you just talking about the last thing I said about the time controls??  Regarding the time controls, I am not baiting.  Of course, most strong players play standard long time controls of 90 minutes etc.  What I meant is that strong players on chess.com (online specifically) MOSTLY play Blitz and Bullet (3 min and 1 min in particular).  Offline they play in OTB tournaments typically in long time controls.  I didn't specify in my response so my bad.  But yeah, just check the top games being played in live chess to see what I mean.  You will find almost all games to be either 3 minute or 1 minute.  

When it comes to fianchettoing I always say I find it passive compared to just placing a bishop in the center. There are a few situations where fianchettoing is better but those situations arise when you already intended on a fianchetto a move or two earlier, and I find that passive too.

I got double fianchettoed once. I was in bed for three days!

Good luck, Thanks

Bro, again I am just very good as black.  I could start losing a bunch of games as black and stuff and you would be like "okay all is in order."  See what I mean?  

Most top players have NEGATIVE ratios as black!  This means they lose more than they win. 

I actually win more as black than I lose.  And SAME with white.  I win more than I lose.  My ratio of win/loss is exceedingly positive. 

And again, there are famous examples of players who have had similar experiences as black.  The tennis example is not good.  Playing the black pieces does NOT put you at the same disadvantage as returning serve bro.  Are you crazy?

It's not bad at all... just control the center, develop your pieces, wait for your opponent to castle and castle the other side, trade the bishop where your opponent's king is castled and attack them with a pawn storm! For example:

something like that

Always remember the combination of Bishop, queen, and harry the h-pawn (alongside garry the g-pawn if they play Nf6 and you don't wanna sac a pawn

True but that;s kind of what he'll face

Also just giving an example

kamsky and spassky would like a word.