The principle which lies behind a rating is this. The rating is a prediction of how well a player will perform against other players of different ratings. If the player does better than predicted, their rating goes up; if they do worse, their rating goes down. An arithmetic calculation shows by how much the player's rating changes. Today, all results are fed into a computer database, and computer software does all the calculations. Then the list is published as a 'rating list'.= = = Great white pelican = = =
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