I have never read an opening-book. I have never took a lesson of chess. I have never analysed a game of chess.I play endgames really bad. My rating is normally between 1550 an 1600 in Blitz on chess.com. I cannot believe that i would ever beat an FM on the board even if it was only blitz. I only think that you are a bad blitz player, or you simply play blitz very rarely.
Why is my blitz rating on Chess.com 600 points lower than my USCF rating?
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Mar 30, 2017
0
#23
I am 1700 FIDE classic OTB, but i have wins against much, much stronger than me in blitz , serious OTB players think about blitz as a fun , joke chess and dont bother much..but most players online take blitz chess very. very serious and they have wins vs high rated players and they rating jumps.
Many possibilities, but the main thing is that ELO ratings cannot be compared for different groups of players. USCF has its members, and chess.com has its members. How much they intersect is hard to say, but they are different groups.
For example, if chess players are ,on the average, better in Russia than USA, and chess.com has mostly Russian players, then your chess.com ELO rating will be lower than USCF assuming they use similar ELO formula and starting ratings.
So, it reasons to mean that the average chess.com players are stronger than the average USCF players, given the above ELO assumptions.
The take away is to not make a direct comparison. However, the ratings should positively correlate, so you and your friends can reasonably expect same ranking (relative to each other) as USCF on chess.com.
Note how this thread is two years old, and my blitz ratings caught up since then
Mar 30, 2017
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#26
gargoyle15 wrote:
I don't understand how it is possible to be a 2100+ USCF rated player and have a rating in five-minute chess of 1550.
Some of the difference might just be that I am bad at thinking fast, but, come on, 600 points???
Judging from my opponents' opening book knowledge I would put them as mid A-players, about 1900. So, yes, maybe I am only an "A-player" at blitz, but that still does not explain at least 300-400 points of difference.
I mean OTB there is no chance on the planet I would EVER lose to a USCF 1550 at ANY time limit. They drop pieces and make basic positional errors. I mean if I put a clock in front of some 1500 at my club and played blitz it would be a joke, I would win 100 games in a row. In fact, even when I play blitz over the board with weak A-players (1800 or so) I crush them consistently.
So, what is the story with online blitz? 1600 players are actually candidate masters (2100)? That's what seems to be the case. The "pool" of online blitz players seems to be MUCH stronger than regular tournament players.
If you mean you are 2100+ in regular OTB USCF rating, it means there's probably something about your thinking process that doesn't work well in blitz, where you have to develop and attack quickly, recognize patterns quickly, etc.
I've had a 2100+ USCF Correspondence rating since the pre-home-computer-engine 1970's, but I have had much trouble in 30 min. OTB games with players over 1600, especially as Black. Two hour games and I'm a little better. Right now I'm trying to improve the efficiency of my thinking process and my tactics/pattern recognition and also want to be more aggressive, especially as Black.
Sep 7, 2017
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#27
Real live games I usually match well with 1400 - 1500 players (at least in my chess club and live tournaments) - in here I constantly find myself around 1100 - 1200, so competition in definitely strong on chess.com (IMO).
However - its just a number really, I just enjoy the game - and at least and most importantly, I think the opposition I meet here on Chess.com matches my level... so its really just a number thing.
I might be more upset about it if I felt I was a much higher rated player though - I dont know? 
Jun 9, 2022
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#28
AlphaDisco wrote:
importantly, I think the opposition I meet here on Chess.com matches my level...
One of my least favorite things about this site is this seems not to be true at all. I rarely have interesting games (especially in blitz), because the players at my (very low) elo are skill distributed bimodally around me - for most opponents, either they are way better or way worse.
Jun 9, 2022
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#29
I would assume it is because OP is just not good at online blitz. My otb UScF rating is over 2000, and my blitz hovers around 2200-2300.
Oct 8, 2022
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#30
Stronger players tend to play blitz. I find that I can move my blitz rating from 600 to 750 just by focusing on speed and pre-moves but then slip back. Also, as noted above, newbies start at 1200.
Mine is over 900 points lower and I never play anyone strong so even going 6-2 against 900-1050 players gains you virtually nothing. The ratings are completely bogus for blitz and only slightly better for rapid chess. In daily games my rating is much closer to my OTB rating of over 1800. I just play the blitz for fun and consider the ratings to be ridiculous.
notmtwain wrote:
The main problem is that chess ratings are completely arbitrary. They don't measure anything absolute, so they can't be easily calibrated to match each other.
You don't seem to understand that ratings only compare you to other players in the particular group being rated, to help you find good matches..
Look at the graph of player ratings and you will see that your 1626 blitz rating puts you into the top 10% of blitz players here on chess.com.
Man that makes me feel so terrible for being at 700 ranking... at my peak... I know a few openings and occasionally hang pieces/make blunders but damn I did not expect to be so far below 'average' 
Oh well at least I can beat my sister every time haha
Blitz and standard chess are different games requiring different skill sets.