Hi

Player A rated 650 which is below Player B by 100 played the 5-min game where lower rated player won. Obviously, by the rules of chess.com, higher rated Player B loses 10 points and becomes rated 740, but, all of a sudden Player A becomes rated 958.

Question 1: Which rating do you think is corrupt 

A: Player A

B: Player B

C: Both players ratings are corrupt.

Question 2:

If rating of Player B is true should his rating be adjusted instead at least by +4 or cancel this game because of disguised rating?

Question 3:

How often it's happening to anyone who reads my post?

If A gained that many points from one game, it's because he hasn't played enough games yet to determine an accurate rating, and it's still fluctuating wildly.  That's just part of how the ratings system works.   Neither is "corrupt", the 650 elo is likely just not an accurate number.

Even if it were, accurate outcomes of all games under 1000 are variable / noisy always, and it's really the case here on CC - basically random here, drawing uniformly, so don't worry about it.

too many games like these. Way too many. Once in a while cool, every other game not.

When you have a ton of new members, you are going to have a ton of new players with unstable ratings.  That will happen more often at the lower rating levels as the new players will be more likely to start there.

PawnTsunami, i know PERFECTLY that there are tons of new players starting with lower ratings, but to my issue it is absolutely irrelevant. I question wrong math. There's a scale when you play a certain level player let's say 750 vs. 950 which is 200 difference in points. in 5min bullet it's +14 right? When I played player with 714 rating and lost which was -9, his rating revealed as 955 which clearly means that I had to get instead of -9 nothing, because if the difference is larger than 200, the lower player does not get rating drop. See my math...? Anybody knows math here??

The difference in rating is not the only factor in determining the points gained/lost for a game.  The rating deviation (RD) is a key component to that figure.  If the RD is high (either for you, or for your opponent), the rating gained/lost will be wildly different than if you have a stable RD.

For example:  https://www.chess.com/game/live/69613621861

In that game, your opponent had not played a blitz game in 5 years.  His RD was so high that a single win over you gave him 500 rating points (pushing him from 400 to 900).  You lost 9 points for losing to someone who was rated roughly at the same level as you when the game was played.  That is how the Glicko system works.  The math is not incorrect - in fact, you might want to look up how the math for the Glicko system works before trying to assert "anyone knows math here??"

Thanks for posting. I was looking for that X-factor that will help me to understand. Apparently I've tried hard enough to find it within the site, but couldn't. Need to get PHD on how that machine works

Okay, I'm still having lots of unsolved curiosity.

Here's scenario:

Player A rated 900 plays player B rated 750 on 5-min blitz. After player B wins and gets deserved 12 points, Player A rating shows as 806 which is far below the 12 points drop.

Question: What was actually the actual rating of Player A or in other words, what rating would player A see on his end?

A) You'd never know what rating player A has if you're player B

B) Player A rating was 815 and lost 9 points after the game with player B

Can it be that you were unable to find out that Chess.com uses the Glicko rating system?

Glicko has a component that looks at rating accuracy by looking at how many games the players have played, how recent they were, etc.

New players by definition have inaccurate ratings-- so their ratings adjust very quickly- sometimes by hundreds of points after one game.

How do ratings work on Chess.com?

Everyone on Chess.com has a rating. The purpose of this rating is to try to show the level of skill of each player, to better match you against other players of equal rating. 

You’ve probably noticed that after you win or lose a game, your rating doesn’t always go up or down by the same amount. What causes this difference? 

A few things can affect how much your rating changes after you play a game. Some things that can affect this are:

1. The difference in rating between you and your opponent
2. How confident we are of your rating
3. How confident we are of your opponent’s rating

Number one is pretty straight forward. If you win against someone who has a much higher rating than you, your rating will go up by a higher amount than if you win against someone of your same rating, or of a lower rating. 

Similarly, if you lose against someone with a lower rating, your rating will go down more than if you lost to someone with a higher rating. 

Numbers two and three on the list are a bit more complicated. It might sound strange, but confidence in the rating is the main reason for big changes in your rating after a game. 

Chess.com uses the Glicko rating system, and part of this system is a number called a ‘rating deviation’ or RD, which measures how sure we are of what your rating is. If you've never played any games on Chess.com before, the system has no idea of what your 'real' rating is, so it will move your rating up and down a lot during the first few games you play.

If you aren't new, but haven't played any games for a while, your RD will also go up, and the next game you play might change your rating by a lot. 

This is because Chess.com hasn’t seen any games from you in a while, and there is no way to tell whether you’ve been practicing and getting better other places, or if you haven’t been playing at all. 

The same applies to your opponents as well. If you lose to someone who is several hundred rating points lower than you, but with a very high RD (they haven't played in a long time), your rating won’t change much, because we can’t be sure that is their actual rating.

If you’re curious about more of the inner workings of the rating system, check the articles here and here! 

Our advice to you, though, is to just play games and have fun, and let the rating sort itself out!