Board Thread:Fun and Games/@comment-176.41.81.152-20150323163656/@comment-117.248.246.206-20150402155824

Read this,

http://en.wikipedia.org/wiki/Elo_rating_system

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%.