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From Lichess to the Board: Converting Online Blitz Ratings to FIDE Ratings

#2

I used a similar approach for the ChessMonitor Elo estimate (number are somewhat similar):

https://i.imgur.com/884ILlK.gif

I was using all time controls though and put more focus into cleaning the data.

Check out this post for more information: https://www.chessmonitor.com/blog/2023-elo-calculation

I used a similar approach for the ChessMonitor Elo estimate (number are somewhat similar): https://i.imgur.com/884ILlK.gif I was using all time controls though and put more focus into cleaning the data. Check out this post for more information: https://www.chessmonitor.com/blog/2023-elo-calculation
#3

The formula gave a pretty good result for me and I'm under 2000. My lichess blitz:1775, fide classical: 1695 and the formula gave 1680

The formula gave a pretty good result for me and I'm under 2000. My lichess blitz:1775, fide classical: 1695 and the formula gave 1680
#4

It would be interesting to extend that to LiChess rapid ratings.

It would be interesting to extend that to LiChess rapid ratings.
#5

It would be interesting to extend that to LiChess rapid or classical (but not correspondence!) ratings.

It would be interesting to extend that to LiChess rapid or classical (but not correspondence!) ratings.
#6

I see 3 flaws.

  1. Blitz is a different game from classical time control. It is like guessing a tennis rating from a ping pong rating.
    We all know players much better or worse in blitz than in classical time control.
    Classical time control requires stamina to stay concentrated for hours.
    Blitz requires strong nerves, fast decisions, dexterity.
    You should compare the lichess blitz rating to the FIDE blitz rating.

  2. Self reported ratings are useless. Maybe it is an outright lie, or outdated. Better is to identify lichess players based on their self reported name or FIDE ID and look up their FIDE profile to retrieve their FIDE blitz rating.

  3. Fitting y = a*x + b is conceptually wrong.
    Expected outcome of blitz game between A and B on lichess = expected outcome of blitz game between A and B on FIDE.
    lichess blitz rating of A - lichess blitz rating of B = FIDE blitz rating of A - FIDE blitz rating of B
    lichess blitz rating of A - FIDE blitz rating of A = lichess blitz rating of B - FIDE blitz rating of B
    So you should fit y = x + b
    Your 0.8 should be 1.

I see 3 flaws. 1) Blitz is a different game from classical time control. It is like guessing a tennis rating from a ping pong rating. We all know players much better or worse in blitz than in classical time control. Classical time control requires stamina to stay concentrated for hours. Blitz requires strong nerves, fast decisions, dexterity. You should compare the lichess blitz rating to the FIDE blitz rating. 2) Self reported ratings are useless. Maybe it is an outright lie, or outdated. Better is to identify lichess players based on their self reported name or FIDE ID and look up their FIDE profile to retrieve their FIDE blitz rating. 3) Fitting y = a*x + b is conceptually wrong. Expected outcome of blitz game between A and B on lichess = expected outcome of blitz game between A and B on FIDE. lichess blitz rating of A - lichess blitz rating of B = FIDE blitz rating of A - FIDE blitz rating of B lichess blitz rating of A - FIDE blitz rating of A = lichess blitz rating of B - FIDE blitz rating of B So you should fit y = x + b Your 0.8 should be 1.
#7

#5
"extend that to LiChess rapid or classical"
Lichess has wrong definitions of rapid and classical.

'A.1 A ‘Rapid chess’ game is one where either all the moves must be completed in a fixed time of more than 10 minutes but less than 60 minutes for each player; or the time allotted plus 60 times any increment is of more than 10 minutes but less than 60 minutes for each player.'
'B.1 A ‘blitz’ game is one where all the moves must be completed in a fixed time of 10 minutes or less for each player; or the allotted time plus 60 times any increment is 10 minutes or less for each player.'
https://handbook.fide.com/chapter/E012023

So the most played rapid control on lichess 10+0 is in fact blitz, and even more with berserk.
Lichess considers 30+0 and 30+20 classical, though it is rapid.

#5 "extend that to LiChess rapid or classical" Lichess has wrong definitions of rapid and classical. 'A.1 A ‘Rapid chess’ game is one where either all the moves must be completed in a fixed time of more than 10 minutes but less than 60 minutes for each player; or the time allotted plus 60 times any increment is of more than 10 minutes but less than 60 minutes for each player.' 'B.1 A ‘blitz’ game is one where all the moves must be completed in a fixed time of 10 minutes or less for each player; or the allotted time plus 60 times any increment is 10 minutes or less for each player.' https://handbook.fide.com/chapter/E012023 So the most played rapid control on lichess 10+0 is in fact blitz, and even more with berserk. Lichess considers 30+0 and 30+20 classical, though it is rapid.
#8

No leí su artículo completo, si apliqué la fórmula para ver mi rating y se ajusta bastante a la verdad.
Gracias.

No leí su artículo completo, si apliqué la fórmula para ver mi rating y se ajusta bastante a la verdad. Gracias.
#10

I appreciate the effort but if you're combining rapid and blitz numbers as was alluded to in #7 that's a problem.

I appreciate the effort but if you're combining rapid and blitz numbers as was alluded to in #7 that's a problem.

This topic is now closed.