# Talk:Elo rating system

WikiProject Chess (Rated C-class, Top-importance)
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WikiProject Board and table games (Rated C-class, Mid-importance)
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## Chess photo

I no like the photo. I'll like there to be real Chess position, where the figures are exactly in the centre of squares. The Chess figures do not made the game, but the combination of figures and rules. This design where the figures are placed like in 'still life' art by some artist give wrong inspiration what exactly is Cheese game.
For comparison, I adore the 'Go' photo. I don't know to play 'Go', but I see the photo and I know what it is about. The chess photo is misleading. — Preceding unsigned comment added by 46.10.229.1 (talk) 16:16, 19 June 2012 (UTC)

## How the normal/logistic distribution effects？

There is only one formula for expected score as this: $E_A = \frac 1 {1 + 10^{(R_B - R_A)/400}}.$ If normal distribution and logistic distribution use the same formula, what's the difference between them? I come for more mathematical details. --Waterture (talk) 09:50, 10 July 2012 (UTC)

## Jeff Sonas

Regarding "The chess statistician Jeff Sonas believes that the original K=10 value (for players rated above 2400) is inaccurate in Elo's work" -- is Sonas' opinion well-supported by independent sources? Shawnc (talk) 09:28, 21 July 2012 (UTC)

I hope someone else gives you a more definitive answer, but I think the answer is yes. Jeff Sonas is considered an expert on chess rating, and I believe that FIDE has consulted him on this subject. I also think that FIDE is currently either experimenting with or perhaps has made a change in the K-value used in chess ratings. I'm sure there are people here more geeked up on the details of the rating system who can provide details. If sources are available, some of this should go in the article. Quale (talk) 19:34, 21 July 2012 (UTC)

## "Ratings inflation"

I have just noticed that this article uses "ratings inflation" instead of "rating inflation". Google tells me that the former is used more than the latter, and I have seen both spellings used in respectable sources. Are both grammatically correct? Toccata quarta (talk) 22:00, 30 April 2013 (UTC)

It's very late in coming, but I thought your question deserves some response. As far as I know, both expressions are grammatical in English. Quale (talk) 15:45, 25 June 2013 (UTC)

## References

We should discuss this rather than revert each other. Toccata, in this case I have to agree with BarrelProof. Template:Refimprove at the top of the page is not helpful for this article as it has 46 inline cites. Use inline Template:cn where needed to point out specific issues. Quale (talk) 02:37, 4 June 2013 (UTC)