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A chess rating system is a system used in chess to estimate the strength of a player, based on their performance versus other players. They are used by organizations such as FIDE , the US Chess Federation (USCF or US Chess), International Correspondence Chess Federation , and the English Chess Federation .
An equivalent way to calculate this performance rating is by taking the average of opponent's rating + 400 for each win; opponent's rating - 400 for each loss; just their rating for each draw. A disadvantage becomes obvious: An additional win against a low-rated player can actually lower your performance rating.
Some chess organizations [16]: p. 8 use the "algorithm of 400" to calculate performance rating. According to this algorithm, performance rating for an event is calculated in the following way: For each win, add your opponent's rating plus 400, For each loss, add your opponent's rating minus 400, And divide this sum by the number of played games.
Larry Kaufman published an article in 2023 estimating the ratings of chess players throughout history by comparing their games with the choices of top engines, using Chess.com accuracy scores. He considered only world championship matches and tournaments (official or unofficial, and including women's championships), Candidates and Interzonal ...
Mark Glickman created the Glicko rating system in 1995 as an improvement on the Elo rating system. [1]Both the Glicko and Glicko-2 rating systems are under public domain and have been implemented on game servers online like Counter-Strike: Global Offensive, Team Fortress 2, [2] Dota 2, [3] Guild Wars 2, [4] Splatoon 2, [5] Online-go.com, [6] Lichess and Chess.com.
The Universal Rating System (URS) is a system for rating chess players devised by Jeff Sonas, Mark Glickman, J. Isaac Miller and Maxime Rischard. It was introduced to determine seedings and qualifications for the 2017 Grand Chess Tour .
A norm in chess is a high level of performance in a chess tournament. [1] The level of performance is typically measured in tournament performance rating above a certain threshold (for instance, 2600 for GM norm), and there is a requirement on the level of tournament, for instance by a prescribed minimal number of participants of given title/level one meets.
US Chess implements rating systems for chess players. In each system, a rating is a calculated numerical estimate of a player's strength, based on results in tournament play against other rated players. Tournament organizers submit results to US Chess, which carries out the calculations and publishes the results.