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Chessmetrics
Chessmetrics is a system for rating chess players devised by Jeff Sonas. It is intended as an improvement over the Elo and Edo rating systems. Implementation Chessmetrics is a weighted average of past performance. The score considers a player's win percentage against other players weighted by the ratings of the other players and the time elapsed since the match. A 10% increase in performance is equivalent to an increase of 85 rating points. The weighting of previous matches digresses linearly from 100% for just-finished matches to zero for matches conducted more than two years ago. Formulas Performance rating adjustment after tournament: :Performance Rating = Average Opponents' Rating + PctScore - 0.50) * 850/code> Weighting of past tournaments (age is how many months ago the tournament was played): :100% * (24 - age) Reception In 2006 economists Charles C. Moul and John V. C. Nye used Chessmetrics to determine the "expected" results of games, and wrote:Ratings in chess t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Comparison Of Top Chess Players Throughout History
Several methods have been suggested for comparing the greatest chess players in history. There is agreement on a statistical system to rate the strengths of current players, called the Elo system, but disagreement about methods used to compare players from different generations who never competed against each other. Statistical methods Elo system The most well known statistical method was devised by Arpad Elo in 1960 and elaborated on in his 1978 book ''The Rating of Chessplayers, Past and Present''. He gave ratings to players corresponding to their performance over the best five-year span of their career. According to this system the highest ratings achieved were: * 2725: José Raúl Capablanca * 2720: Mikhail Botvinnik, Emanuel Lasker * 2700: Mikhail Tal * 2690: Alexander Alekhine, Paul Morphy, Vasily Smyslov Though published in 1978, Elo's list did not include five-year averages for later players Bobby Fischer and Anatoly Karpov. It did list January 1978 ratings of 2780 fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chess Rating System
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. Most of the systems are used to recalculate ratings after a tournament or match but some are used to recalculate ratings after individual games. Popular online chess sites such as Chess.com, Lichess, and Internet Chess Club also implement rating systems. In almost all systems, a higher number indicates a stronger player. In general, players' ratings go up if they perform better than expected and down if they perform worse than expected. The magnitude of the change depends on the rating of their opponents. The Elo rating system is currently the most widely used (though it has many variations and improvements). The Elo-like ratings systems have been adopted in many other contexts, s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jeff Sonas
Jeff Sonas is a statistical chess analyst who invented the Chessmetrics system for rating chess players, which is intended as an improvement on the Elo rating system. He is the founder and proprietor of the Chessmetrics.com website, which gives Sonas' calculations of the ratings of current players and historical ratings going back as far as January 1843. Sonas has written dozens of articles since 1999 for ChessBase.com and other chess websites. He was a participant in the FIDE ratings committee meeting in Athens, Greece in June 2010. In 2002 he wrote for chessbase.com that a 24 k-factor would be ideal for predicting game results, instead of the standard 10 for high level players. In 2009 John Nunn wrote he needed more proof for the change. Sonas replied saying Nunn didn't thoroughly read his first article, but also says there is room for improvement, as he didn't analyze what it should be for low level players. In 2011 after analyzing 1.5 million FIDE rated games, he demonstrat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elo Rating System
The Elo rating system is a method for calculating the relative skill levels of players in zero-sum games such as chess or esports. It is named after its creator Arpad Elo, a Hungarian-American chess master and physics professor. The Elo system was invented as an improved Chess rating system, chess-rating system over the previously used Harkness rating system, Harkness system, but is also used as a rating system in association football, association football (soccer), American football, baseball, basketball, pool (cue sports), pool, various board games and esports, and, more recently, Large language model, large language models. 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 th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Weighted Average
The weighted arithmetic mean is similar to an ordinary arithmetic mean (the most common type of average), except that instead of each of the data points contributing equally to the final average, some data points contribute more than others. The notion of weighted mean plays a role in descriptive statistics and also occurs in a more general form in several other areas of mathematics. If all the weights are equal, then the weighted mean is the same as the arithmetic mean. While weighted means generally behave in a similar fashion to arithmetic means, they do have a few counterintuitive properties, as captured for instance in Simpson's paradox. Examples Basic example Given two school with 20 students, one with 30 test grades in each class as follows: :Morning class = :Afternoon class = The mean for the morning class is 80 and the mean of the afternoon class is 90. The unweighted mean of the two means is 85. However, this does not account for the difference in number of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ICGA Journal
The ''ICGA Journal'' is a quarterly academic journal published by the International Computer Games Association. It was renamed in 2000. Its previous name was the ''ICCA Journal'' of the International Computer Chess Association, which was founded in 1977. The journal covers computer analysis on two-player games, especially games with perfect information such as chess, checkers, and Go. It has been the primary outlet for publication of articles on solved games, including the development of endgame tablebases in chess and other games. For example, John W. Romein and Henri E. Bal reported in the journal in 2002 that they had solved Awari and, in 2015, David J. Wu reported his solution for the Arimaa Challenge.{{cite journal , first=David J. , last=Wu , year=2015 , title=Designing a Winning Arimaa Program , journal=ICGA Journal , volume=38 , number=1 , pages=19–40 , doi=10.3233/ICG-2015-38104 , url=https://icosahedral.net/downloads/djwu2015arimaa.pdf From 1983 till 2015 ''ICGA J ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chessbase
ChessBase is a German company that develops and sells chess software, maintains a chess news site, and operates an internet chess server for online chess. Founded in 1986, it maintains and sells large-scale databases containing the moves of recorded chess games. The databases contain data from prior games and provide engine analyses of games. Endgame tablebases are also provided by the company. ChessBase's Indian YouTube channel ChessBase India has amassed more than 2.5 million YouTube subscribers and more than 2.5 billion total views as of December 2024. History Starting in 1983, Frederic Friedel and his colleagues put out a magazine ''Computer-schach und Spiele'' covering the emerging hobby of computer chess. In 1985, Friedel invited then world chess champion Garry Kasparov to his house. Kasparov mused about how a chess database would make it easier for him to prepare for specific opponents. Friedel began working with Bonn physicist Matthias Wüllenweber who created the first ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Week In Chess
''The Week in Chess'' (TWIC) is a chess news web site. It was founded in 1994 and is based in the United Kingdom. ''TWIC'' has been edited by Mark Crowther since its inception in 1994. It began as a weekly Usenet Usenet (), a portmanteau of User's Network, is a worldwide distributed discussion system available on computers. It was developed from the general-purpose UUCP, Unix-to-Unix Copy (UUCP) dial-up network architecture. Tom Truscott and Jim Elli ... posting, with "TWIC 1" being posted to Usenet group rec.games.chess on 17 September 1994. Later it moved to Crowther's personal web site, then to chesscenter.com in 1997, and in 2012 it moved to theweekinchess.com. It contains both chess news, and all the game scores from major events. TWIC quickly became popular with professional chess players, because it allowed them to quickly get results and game scores, where previously they had relied on print publications. TWIC still exists as a weekly newsletter, although for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John L
"John L" is a song by English rock band Black Midi, released in 2021 as the lead single from their second studio album, ''Cavalcade (Black Midi album), Cavalcade''. The song describes the story of a powerful leader, the titular John L, who is eventually betrayed and killed by his followers. It was released on March 23, with the B-side Despair and a music video directed by Nina McNeely. A 12-inch release for the single was made available for pre-order on the same day and released on April 9. The song is one of few on ''Cavalcade'' to have writing credits for guitarist Matt Kwasniewski-Kelvin, written before his departure from the band but recorded after. Composition and recording "John L" is an Avant-garde music, avant-garde progressive rock song described by ''Guitar World'' as "[featuring] dissonant piano chimes, weaving hypnotic vocals, a cacophony of string sounds, and an edge-of-the-seat dynamic range, spanning from complete silence to raucous, high-energy midsections." ''Mi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
