i have seen the ratings point increse and decrease in a different manner... sometyms i win just a 10 point and sometimes i win 20.... y is that so... how is this rating points calculated
Rating points aren't calculated. They're magicked. Trust me on this.
http://support.chess.com/Knowledgebase/Article/View/16/13/how-do-ratings-work
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i have seen the ratings point increse and decrease in a different manner... sometyms i win just a 10 point and sometimes i win 20.... y is that so... how is this rating points calculated