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Stories


ELO Rating

Muscler An ELO rating is the result of statistical calculations designed to measure the playing strength of players. These methods were developed by Arpad Elo and are named after him. The ELO system is in almost universal use and has been further refined by others, notably Glicko, but is still named after its creator.

In devising the ELO scale, some premises were used that are worthy of note. It was decided that a rating of 2000 would be the equivalent to scoring 50% in a US Open Championship. It was also decided that a player's rating would never be negative.

Importantly, the standard deviation was fixed at 200 points. This means that if a player's true strength is 1500, he will score around 68% of his results within the range of 1400 to 1600 (as measured by performance formulae). Another result of fixing the standard deviation at 200 points is that it also defines playing categories. For example, most International Masters and Grandmasters are in the 2400 - 2600 category, most national masters in the 2200 - 2400 category. Those in the 2000 - 2200 category are called Experts, or Candidate Masters.


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Classes

The game is the most exciting, when the two players are on the same playing strength. If the difference is too high between their strength, then one player will see the same game boring, that the other will see annihilating.
The playing strength are defined by the elo rating, its value is usually between 800 and 2600 points. Players are divided into different classes according to their playing strength, their elo rating. Players in the same class are in similar playing level.
Tournaments are usually class based, so players in the same level play each other in tournaments (mostly).
The following classes are defined in the club:

Class M 2200-
Class X 2000-2199
Class A 1800-1999
Class B 1600-1799
Class C 1400-1599
Class D 1200-1399
Class E 1000-1199
Class F 000-999
 
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