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How common are multiple users on an account?

I've encountered this a number of times: I'm pretty sure it's not engine cheating, but it's clear that I'm not playing the same person, or the rating is way off. Sometimes I'll play someone who's clearly a 1900, then same account they blitz out a perfect game. Do people do this, have a buddy who's 500 pts stronger play a game on their account here and there?
nobody knows the answer to your question. other than stating that playing strength varies depending on factors beyond your recognition and that your recognition may be flawed as well in the first place, i can only suggest that you play in Zen mode. theres no time in a rapid game for these kind of thoughts if you want to perform and theres no way for you to analyze it afterwards due to lack of information.
dont work yourself up on problems without solutions.
Apart from the fact that I agree normal users can't know, mods might have an idea. Since account sharing is labeled as a violation of the tos I say report them.
Though I wouldn't recommend reporting hundreds of accounts for that as most of the times it's only a feeling and there can be several reasons why someone rated 1900 can play better or worse than that every now and then.
In my experience some peoples skill rates can fluctuate. Sometimes we overperform and sometimes we blunder a queen on move 11. I would bet that this is what is happening.
@handsomechuck said in #1:
> I've encountered this a number of times: I'm pretty sure it's not engine cheating, but it's clear that I'm not playing the same person, or the rating is way off. Sometimes I'll play someone who's clearly a 1900, then same account they blitz out a perfect game. Do people do this, have a buddy who's 500 pts stronger play a game on their account here and there?

Carlsen, a few years ago, said he does this "Like a lot."

Yes it's throwing fair play rules in the trash and yes it's unfair. We were talking about this recently, @Nomoreusernames and I; and it's not just the pain or harm done to those who get cheated against, but it is also the unfair advantage of increased rating points for those who happen to be friends with Aryan Tari, or Carlsen, or someone who does this on a regular basis.

Their view is "Whatever we do is okay because we are immune," and "The rules do not apply to us."

Then you see some breaking point like the recent animosity.
and here he is supposedly screwing over Gustaffson from chess24

youtu.be/Ka5sh6hBvSI

So, if even the world champ does it, and I'm not talking about Hikaru Nakamura, you can bet on it that other people do it too.
>So, if even the world champ does it, and I'm not talking about Hikaru Nakamura, you can bet on it that other people do it too

Maybe a couple of times out of several tens of thousands of games? And if you go search online for players who've done it "once in a while", of course you'll find some.

Just enjoy the games and stop stressing. Don't go looking for reasons to get annoyed.
After cursing me out a number of times,
my old friend @Tryan82 had one last post.

>"But if the World Champion himself is a cheater, then I guess, screw (sic) chess."

No one went looking for the drama, discord, disgustingness, and abuse Carlsen, Rensch et al foisted upon the world but we got to see full page after full page of topics about it for weeks going on end.

This is just the push-back against the one group who actually *IS* cheating on a very regular basis, and going on with their laughter about how the rules don't apply to them and so on and so forth.

When you defend a heinous position, you will frequently say and do heinous things to continue the wrongness of the person you are following.

"Don't follow others," as Rumi said, "for they may be blind, or worse -- vultures."

In some cases both.
World Champ plays some meaningless games under a different account because he doesn't want to be recognized or whatever. You can choose to be outraged or you can chuckle. I choose to chuckle.

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