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How to get better at blitz?

Only way I can ever win at blitz is by flagging my opponent, since I'm unable to find correct moves under severe time pressure I must resort to playing time burners.

You're probably thinking too much. If you're rated 1800 but 1200 can beat you in bullet, you're trying to find good moves and you should stop.
I like what chess_player_17 said, but I'd start with practicing the fundamentals of speed chess which is finding a safe move on your opponent's time, and then playing it within a few seconds once your clock starts. When you calculate, only calculate forcing lines... don't even bother with inbetween moves, just check to see if a move is safe from the most elementary trades / tactics, AND THEN PLAY IT, STOP THINKING!
If you think, wait, I might have a better move... you've already lost! Stop it! First thing's first, practice playing adequate moves quickly.
Once you can figure that out, then you can move on to the stuff the NM is talking about... and you wont feel totally lost when under 1 minute.
My $0.02 on it anyway.

Thanks for the feedback. I tried avoiding playing blitz/billet for a while but when you get down to minutes in a tournament game, it's going to come either way. That's why I started playing in rapid quads more recently, when I often win with seconds on my clock, but if not for delay, I would lose every game..

Blitz is an addiction. Avoid it.
This illustration of my rationalization of my addiction was quoted in Counterplay: An Anthropologist at the Chessboard (2012).
Blitz Addiction
While taking a break from work, I went online to play a couple of blitz games in preparation for tonight's event. I lost the first, badly. The second was worse. After three losses in a row, I knew I was in trouble.
Read the rest at: http://chessskill.blogspot.com/2009/01/blitz-addiction.html

Why do you have to think when every appropriate response gambit or counter gambit or transpositions have been outlined by great masters. Induce your opponent to think by utilising gambit and strange but safe moves.

"You must lead your opponent into a deep dark forest where 2+2=5 and the path leading out is only big enough for one". Mikhial Tal

Move faster. Don't get mated. Don't flag.
Otherwise - get all your pieces out and take care of all immediate threats first.

Actually, the relationship between your blitz (1300) and your standard rating (1600) seems to be pretty much the norm here. So I don't think you have a particular blitz problem. If you want to get better at blitz, get better at chess.

Why are so many players even interested in getting better at blitz? Nobody cares about anything other than your USCF/FIDE standard rating when it all comes down to it.
Getting excited about ratings sure is a blast.
Blitz is just such a shallow, quick, watered down version of chess. It's simply a fast food like addiction and just detracts from your ability to calculate, play positionally, and have a true game of chess.
No fun allowed.

Actually, the relationship between your blitz (1300) and your standard rating (1600) seems to be pretty much the norm here. So I don't think you have a particular blitz problem. If you want to get better at blitz, get better at chess.
It used to be the opposite before chess.com corrected the stardard rating deflation.They might have gone bit overboard with it but I don't think 300 point higher standard rating still is a norm.
Your advice is still hits a home run.

Classical time controls sometimes seem bit too serious for my liking. No doubt you still should play mostly longer time controls if you're looking to get better at chess.

My "quick" rating OTB is 1592 and my real rating is 1828 with no blitz rating as of yet. What chess.com views as standard, such as 15 minute games, OTB is viewed as "quick" games. Anything 60 minutes or below time controls go on your quick rating. 30 minutes is the lowest time I believe for your standard rating to be effected OTB. I think anything below 30 minute games, your quick rating is the only rating that is adjusted. USCF recently brought in a new rule, a "blitz" rating option, however we don't have any blitz tournaments around our club so I don't have a chance to practice rated blitz OTB except in casual night on Tuesdays at our club, which I ocassionally visit.
I'm terrible at blitz/quick chess. I sometimes go to these Action Quads at our club to play rapid 30 min games and I often get down below 5 minutes when my opponent still has above 20. Does this mean I need to quit chess forever or is there something I can do to help?
As you can see my blitz rating is very low on here compared to other ratings. My standard rating is low too, since I usually play 15 minute games and don't do very well. My OTB rating is 1828, but I can't seem to get above 1400 in my blitz rating. Funny thing is, I've actually been doing good in rapid play recently in 30 minute games, but when it comes down to blitz, I can't function when I'm under a minute on time. I just panic and can't think. I tried playing a few bullet games but after being slaughtered by 1200's I kinda gave up on it.