Chess.com is rigged.

And the most important question at last;

Why doesn't it occure on lichess?

it's called going on tilt

i do it here, i do it on lichess

You're right, it's plausible that chess dot com could do this. And it doesn't help that this website is opaque and profit-seeking. If their matchmaking algorithm was open-source, we could dispel this here and now. You don't have to point to games like FIFA; this strategy is highly successful on Facebook and YouTube.

But just because something is plausible doesn't mean it's happening; you may be a victim of a clustering illusion. The burden of proof still remains with you to provide some evidence or means of discovering the evidence. So can you point to a juncture or junctures in your archive of games where you think this happened?

It's also important to remember that openings and Elo aren't deterministic. There's always a margin of error (your Glicko RD is +/- 27). I'm not sure there's a way to simultaneously A) select matches which generate tilt/set you up for tilt B) do this over several matches and C) maintain the perception of randomness. The tilt-generating strategy you describe would likely get more people to quit chess (and stop consuming ads on chess dot com) than subscribe.

I really thank you Mikosche of your post, because I have had exactly the similar experience about Chess.com opponent allocation system being rigged. You are correct, it is, and these rollercoasts of winning and losing streaks are totally made up by the system.
We all have better and worse days, we all agree on that. And there are streaks also with totally random processes like coin tossing, and people are very bad at creating streaks that look random, as Kahneman and his colleagues have shown. But what happens in Chess.com every time I play, is not random, it is rule-based and rigged.
I have many times quitted playing here, and every time I come back, I have a good feeling, like how Chess used to be. Winning some, losing some, with fair fights. But then it starts again. It has thrown me many easy opponents close to my rating level, they are making simple mistakes considering we should be better than 95% of the players on the site, and then boom, suddenly there is a streak of players with Master abilities, from another planet compared to players I just played against, and we are still on the same rating range. They come in every game and just crush it, they play so well and my losing streak continues and continues. And suddenly, like a Sun showing behind the darkest Cloud, I start to win, because I get opponents, who make almost childish mistakes, and we are still at the same rating level. I win, like taking a candy from a child, and then I decide to quit, because this is so rigged. It has nothing to do with my skill, condition, attitude, tiredness, luck or motivation, it is just rigged.
So, thank you Mikosche for writing the truth about this site. I decided that I won't ever play here again, never, even if this would be the last Chess site in the World. This system is rigged, and I am out.

Bye

There is no such thing as a biased matchmaking, opponents are absolutely random.

But if it cannot happen and it does "happen" to someone, are they not then wrong? If, for example, it is statistically and scientifically impossible for anyone to be crushed by a falling piano (which actually might have happened but for the sake of the argument let's pretend), then isn't anyone who says they were crushed by a piano incorrect according to the principles I mentioned earlier? Also, how does "it cant happen" and stuff relate to OP's theory about the chess.com system being rigged? Also also, I just save games to a collection to look at in game review after the 24 hour cooldown is up.

There is some bias, because it tries to pick people with a same Elo on chess.com as you.

But it doesn’t try to minimize your wins or maximize your losses :)

Why is this tinfoil nonsense topic still open after 4 years? People are weird.

People are free to express themselves and confront their opinions in a respectful manner :)

Yeah, at 400 elo you have a wide range of skill sets because it is much easier to rapidly improve in anything at the early stages. So you run into a lot of players working their way up the ladder whose elo is low but their natural skillset and improvement is better than some guy stuck at that level going up and down.

Wanna me to open the door?

SINCE I'm posting ON Chess.coms I'll refrain from talking about it.

FIDE... IS MANIPULATING THE ALGORITHMS. they start you at 1200 elo. (Im 1850s Lichess) First 3 games my opponent's play book moves deep into the middle game and out play me hands down ... Of course I smell cheating ... So i tabbed up Stockfish 18 and the next 3 games playing the 1st candidate move the hole game all my opponent took stockfish 18 (rated 3200 plus) deep past move 40 ... No blunders etc... Won 3 games in a row....obviously I was totally cheating against cheaters ....then the match ups became honest or real ... i was playing humans or people who were not cheating ... so I turned off Stock fish and played ... won about 3/4 of my games.

EIther FIDE IS USING BOTS , or cheating is massive there... I checked backed a week later EXPECTING to see my games flagged as cheating ...Nothing ! I didn't even try to hide it...I use the 1st candidates move every game!) Outside the rampent cheating ...once I won 3 games... it was like something clicked and I could tell I was playing a non cheating humans after that.......(what I experinced was an algorithm manipulation hands down!!!!).... needless to say I will not play there ever again.

So if FIDE is doing it....... who else?