# Talk:Elo rating system

## Elo in Snooker??

In the introduction it is claimed that the elo rating system is used as a rating system in snooker (amongst others). I have removed that until someone can provide a source for that. For me it's just plain wrong. The Snooker World Rankings are based on the prize money won within the last 2 years ("Rankings FAQ - WPBSA".), i.e. where your rating is based on how far you've come in tournaments, and not on the outcome of individual games and the rating of the opponent.

## Elo rating system in Counter strike

The Elo rating system is not and was never used in Couner-Strike: Global Offensive. It's rating System is based on a modified Glicko-2 rating system. Source: Official statement from Vitaliy from Valve. "The CS:GO competitive ranking system started with ideas based on Glicko-2 rating model and improved over time to better fit the CS:GO player base."

I have removed that part from the article.

62.157.193.130 (talk) 12:47, 7 March 2018 (UTC)

## Explaining a bit more the formula with 'Q' quantities

From the article.

${\displaystyle E_{A}={\frac {Q_{A}}{Q_{A}+Q_{B}}}}$

It requires a bit of work to pass from the first formula to this second (this one above is more handy). This because at first one can be puzzled that the denominator cannot be broken immediately. So just to avoid trying I leave it here.

${\displaystyle E_{A}={\frac {Q_{A}}{Q_{A}+Q_{B}}}={\frac {10^{R_{A}/400}}{10^{R_{A}/400}+10^{R_{B}/400}}}={\frac {{\frac {1}{10^{R_{A}/400}}}\cdot 10^{R_{A}/400}}{{\frac {1}{10^{R_{A}/400}}}\cdot \left(10^{R_{A}/400}+10^{R_{B}/400}\right)}}={\frac {1}{1+10^{(R_{B}-R_{A})/400}}}}$

Pier4r (talk) 10:55, 5 May 2018 (UTC)

## Glickman page as EL

User:Quale would you please justify your addition of the EL here per WP:EL? As far as I can see there is no justification in that guideline, for including a link to Glickman's page listing his research papers. Jytdog (talk) 13:48, 17 July 2018 (UTC)

Glickman's publications page includes neutral and accurate material that is relevant to an encyclopedic understanding of the subject. Is there some reason that you think that it violates EL:NO? Quale (talk) 02:06, 18 July 2018 (UTC)

## Elo Rating System in Rainbow Six: Siege

The article lists a bunch of games that use the Elo rating system, but it does not mention Rainbow Six: Siege, which is more popular than all of the other games listed, with CS:GO and Overwatch being exceptions. The two following links explain Elo in R6. I gave the information, now we just need someone to add it to the article (I suck at editing articles directly). https://support.ubi.com/en-us/Faqs/000024743/How-Does-Rank-Work-in-R6-Siege https://rainbow6.ubisoft.com/siege/en-us/news/152-277344-16/matchmaking-rating-and-ranks Adil3214 (talk) 16:26, 4 July 2019 (UTC)

## History section needs more work

When exactly did FIDE adopt the Elo system? And were there unofficial lists before that. The reason I ask is this page [1] gives "FIDE Rating List" back to 1967, but I think it is more correct to say it was an Elo list. There are then lists in 1968, 1969, 1970, two in 1971, then one each in 1972-74. I suspect the July 1971 one is the first official FIDE list. Whatever the case is, the article should make this clear. Adpete (talk) 04:30, 28 August 2019 (UTC)

And perhaps even some pre-Elo history, like here: http://www.chesshistory.com/winter/extra/ratingstitles.html Adpete (talk) 05:22, 28 August 2019 (UTC)
Also see Chess rating system. Bruce leverett (talk) 02:22, 10 February 2020 (UTC)