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Chess ranking system

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Possible Answers:

ELO.

Last seen on: Daily Boston Globe Crossword Monday, 4 December 2023

Random information on the term “Chess ranking system”:

The Elo[a] rating system is a method for calculating the relative skill levels of players in zero-sum games 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 system, but is also used as a rating system in association football, American football, baseball, basketball, pool, table tennis, various board games and esports, and more recently 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 the stronger player is 76%.

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 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.

Chess ranking system on Wikipedia

Random information on the term “ELO”:

Birmingham (/ˈbɜːrmɪŋəm/ ⓘ BUR-ming-əm) is a city and metropolitan borough in the metropolitan county of West Midlands in England. It is the second-largest city in Britain[b] – commonly referred to as the second city of the United Kingdom – with a population of 1.145 million in the city proper. Birmingham borders the Black Country to its west and together with its city of Wolverhampton and towns including Dudley and Solihull to the south-east, forms the West Midlands conurbation. The wider metropolitan area has a population of 4.3 million, making it the largest outside of London.

Located in the West Midlands region of England, approximately 100 miles (160 km) from London, Birmingham is considered to be the social, cultural, financial and commercial centre of the Midlands. It is just west of the traditional centre point of England at Meriden, and is the most inland major city in the country, and lying north of the Cotswolds and east of the Shropshire Hills. Distinctively, Birmingham only has small rivers flowing through it, mainly the River Tame and its tributaries River Rea and River Cole – one of the closest main rivers is the Severn, approximately 20 miles (32 km) west of the city centre. The city does however have numerous canals, collectively named the Birmingham Canal Navigations.

ELO on Wikipedia

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