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Arpad Elo: Difference between revisions
Copying lede section from w:Elo rating system (this revision: https://en.wikipedia.org/w/index.php?title=Elo_rating_system&oldid=1124985178 ). It would seem that ranking systems are pretty good for zero-sum games (like chess, or single-winner elections)
(Copied and adapted the first paragraphs of w:Arpad Elo (this rev: https://en.wikipedia.org/w/index.php?title=Arpad_Elo&oldid=1124022210 )) |
(Copying lede section from w:Elo rating system (this revision: https://en.wikipedia.org/w/index.php?title=Elo_rating_system&oldid=1124985178 ). It would seem that ranking systems are pretty good for zero-sum games (like chess, or single-winner elections)) |
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== Elo rating system ==
{{wikipedia|Elo rating system}}
The '''Elo{{efn|This is written as "Elo", not "ELO", and is usually pronounced as {{IPAc-en|ˈ|iː|l|oʊ}} or {{IPAc-en|ˈ|ɛ|l|oʊ}} in English. The original name {{lang|hu|Élő}} is pronounced {{IPA-hu|ˈeːløː||Hu-élő.ogg}} in Hungarian.}} rating system''' is a method for calculating the relative skill levels of players in [[zero-sum game]]s such as chess. It is named after its creator [[Arpad Elo]], a Hungarian-American physics professor.
The Elo system was invented as an improved chess-rating system over the previously used [[Harkness rating system|Harkness system]],<ref>{{Cite journal |last=Elo |first=Arpad E. |date=August 1967 |title=The Proposed USCF Rating System, Its Development, Theory, and Applications |url=http://uscf1-nyc1.aodhosting.com/CL-AND-CR-ALL/CL-ALL/1967/1967_08.pdf#page=26 |journal=[[Chess Life]] |volume=XXII |issue=8|pages=242–247}}</ref> but is also used as a rating system in association football, American football, baseball, basketball, pool, table tennis, and various board games and esports.
See [[w:Elo rating system]]▼
The difference in the ratings between two players serves as a predictor of the outcome of a match. Two players with equal ratings who play against each other are expected to score an equal number of wins. A player whose rating is 100 points greater than their opponent's is expected to score 64%; if the difference is 200 points, then the expected score for the stronger player is 76%.
[[Category:Deceased]]▼
A player's Elo rating is represented by a number which may change depending on the outcome of rated games played. After every game, the winning player takes points from the losing one. The difference between the ratings of the winner and loser determines the total number of points gained or lost after a game. If the higher-rated player wins, then only a few rating points will be taken from the lower-rated player. However, if the lower-rated player scores an [[Upset (competition)|upset win]], many rating points will be transferred. The lower-rated player will also gain a few points from the higher rated player in the event of a draw. This means that this rating system is self-correcting. Players whose ratings are too low or too high should, in the long run, do better or worse correspondingly than the rating system predicts and thus gain or lose rating points until the ratings reflect their true playing strength.
Elo ratings are comparative only, and are valid only within the rating pool in which they were calculated, rather than being an absolute measure of a player's strength.
▲See [[w:Elo rating system]] to learn more.
==References==
<references />
▲[[Category:Deceased]]
[[Category:Rated method elections]]
[[Category:Ranked voting methods]]
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