We only allow members to have one account on the site. Each member loses and gains points based on a number of factors including the number of games they've played, their opponents rating, their rating when they started the game, etc. For more information on how ratings are calculated, please visit the link below:
http://support.chess.com/Knowledgebase/Article/View/16/0/how-do-ratings-work
why is there a Different score system in the site?
I have 2 user-names ,one is incriminated by ~8 and other by ~40 why is that?