In order to make the systems appear similar 100 in the ranking system equates to 2000 in the published rankings. A review of this initial grade is carried out after the first few game results have been processed for the new player, and if necessary, the initial grade will be altered and the calculation re-run to give a result that appears correct. New players are usually given a grade between 1700 and 1900. The calculations do have a statistical basis. The CGS is based upon work done in Chess, namely the Elo Chess ranking system.
Players gain points based on the difference in the grades of the two players.
If the player with a higher grade wins then fewer points change hands than if the lower graded player wins. As a player's grade rises it gets harder and harder for them to gain points. If a player only plays 'weak' opponents then he or she will gain very few points. The more games played the more accurate the position. Though above a certain number of games there is very little difference.