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11 votes
Accepted

What are FIDE really hoping to achieve by the proposed rating changes from January 2024?

The justification is that lower rated player are outperforming their rating when playing higher-rated players. When a 1000-ish player played an 1800-ish player, the rating system expects the lower-...
D M's user avatar
  • 19.7k
10 votes
Accepted

Skill degradation

During the epidemic I didn't play for 2-3 years. Before I stopped I had Lichess blitz rating around 2000, after I resumed my rating fell to 1600. Mostly due to missing simple 1 or 2 ply tactics. To ...
Matija Sirk's user avatar
  • 2,603
7 votes
Accepted

Are Elo ratings comparable across history?

Statistician and ratings expert Jeff Sonas writes "[A] rating always indicates the level of dominance of a particular player against contemporary peers; it says nothing about whether the player ...
SecretAgentMan's user avatar
6 votes

Now that FIDE's anti-deflation rating adjustments have been done, what do they look like?

I took the FIDE rating data from the FIDE rating download page, loaded it into a database and ran some queries to get scatter plots for February 2024 and March 2024. This is what I got for February: ...
Brian Towers's user avatar
  • 98.3k
6 votes

Why do boys become better than girls?

Hou Yifan did an interview with Chess.com where she answered some questions about why there has been such a persistent gap between men and women when it comes to top-level chess. Chess.com - Hou Yifan ...
Nelson O's user avatar
  • 725
5 votes

Why do boys become better than girls?

There was a study on this a few years ago, where researchers concluded that the number of women that were represented in the top players correlated with the number of women that participated at a ...
JohnP's user avatar
  • 748
3 votes
Accepted

Cheating with team order

The expected score for a player with a rating advantage of e is (1+10^(e/400))(^-1) The expected score over seven boards is seven times this, and for the trick to work (ie not to lose) this must be at ...
Philip Roe's user avatar
  • 8,623
3 votes
Accepted

USCF rating floor exploitation

the outcome of a game produces a zero-sum change in ratings between the two players It's not zero-sum in the USCF. Due to the rather convoluted way K is calculated, it's likely that the lower rated ...
D M's user avatar
  • 19.7k
3 votes
Accepted

Opportunities to Play Online Chess with Grandmasters for a 2000 Elo Player

There are some ways where you can get a match vs GMs. I've played a bunch of them in the following ways: Many GMs like Minh Le, Benjamin Bok, Eric Hansen, and Hikaru stream on Twitch. Sometimes, they ...
Abhyuday Vaish's user avatar
3 votes

Are Elo ratings comparable across history?

I am not a statistician, so I can't speak to the accuracy of ELO ratings across time, but as a historian, I would say that comparing players from different eras is ultimately a flawed (if fun) project ...
rougon's user avatar
  • 941
2 votes

What sets the absolute value of players' Elo rating?

What sets the absolute value of players' ELO rating? The design of the rating scale is explained by Elo in Chess Life, august 1967 (P243). In the chess world, the player category or class concept ...
clp's user avatar
  • 265
2 votes

What is the average strength level (ELO) in Lichess anonymous?

My evaluation is that the average opponentthat you will find does NOT have the average elo. Both in rated and non rated the distribution of games does not match the distribution of players. I am not ...
Dennis Jaheruddin's user avatar
2 votes

Is there a software to measure a player's strength based on a game?

Since about April 2023, chess.com's game review has an estimated rating feature. Unfortunately, unless you have a membership you only get one review a day. I can't vouch for its accuracy either.
qwr's user avatar
  • 3,902
2 votes

What happens if my initial rating is below 1000?

FIDE rating floor was raised to 1400 on 1. March 2024. If your first rating is under rating floor, or if your rating drops under 1400, you are unrated. Relevant parts of rating regulations: 7.1.4 ...
Matija Sirk's user avatar
  • 2,603
1 vote

Why is my performance low even with a high accuracy on chess.com?

Most likely you didn't have the opportunity to play any tactics; I'd say this is rather normal since your opponent blundered the game rather early. You can think of the accuracy as how close you ...
Paweł's user avatar
  • 163
1 vote

Skill degradation

You really don't give us much to work with. What time limit are you playing at? Are these OTB or online? A technique recommended to avoid blunders OTB used to be to write the move down before making ...
Philip Roe's user avatar
  • 8,623
1 vote

Is there any software or web service for club-level Elo ratings?

https://skillrank.games Also allows ratings for team games where individuals change teams between games
Joshua Johnson's user avatar
1 vote

What is the average strength level (ELO) in Lichess anonymous?

Classical: 1550 Rapid: 1475 Blitz: 1475 Bullet: 1475 UltraBullet: 1325
Matthew's user avatar
  • 359
1 vote

How many games would Magnus Carlsen need to win to get an ELO of 3000?

A player's FIDE rating is updated according to the formula Rnew = Rold + K(W-We) where K = 10, according to (https://www.fide.com/docs/regulations/FIDE%20Rating%20Regulations%202022.pdf). W = actual ...
clp's user avatar
  • 265
1 vote

Are cyborg (human+computer) players really better than the best chess engines?

At this point in time in my opinion the human factor in a computer + human vs computer game might still be playing a difference, although I'm not aware of any experiments in this field done recently. ...
Andrea Nerla's user avatar
1 vote

Online resource for estimating my elo rating using my games?

My suggestion would be to estimate your rating based on your ACPL (average centipawn loss). You should be able to find this by using Chess Compass and looking at the report tab. I would recommend ...
Hank's back rank's user avatar
1 vote

How to calculate the FIDE Percentage Expectancy Table

Table 8.1a is a mirror image of: The Percentage Expectancy Table (A.E. Elo The Rating of Chess Players, 2.11) D P | D P | D P Rtg.Dif H L | Rtg Dif H L | ...
clp's user avatar
  • 265
1 vote

How large can a rating difference become before either player realizes it's not worth engaging in a game?

The published rating of a player is not the same as a perfectly correct rating of a players strength. It is easy for a low rated player to improve faster then a rating (over the board) system can ...
Ian Ringrose's user avatar
  • 1,029

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