A system by professor Glicko is used to calculate chess rating.

Its main difference from Elo rating consist in the index of statistical error (rating deviation) which depends not on a player’s activity, but on the amount of time of his/her inactivity. The more he/she is idle, the more the discrepancy is. The discrepancy is individual for each player. Thus the rate of incrementation of a rating may differ between players after a game. The player who haven’t played for a longer time will have more incrementation. For example, a player can get 100 points for a win, but in the meantime his/her opponent can lose only 10. More details here.

A player has individual ratings for each type of game and time, that is games of different time and type of game are calculated separately.

Rating deviation

Rating deviation is used not only to determine rating gain more accurately, but to calculate player's activity rate also. At the present time the threshold value amounts to 70. You can see this value on chess statistics page. Those players who have value more than 70 do not participate in

• Chess rating
• The most successful players rating

Top users based on chess rating

Those players having the highest rating in a certain category of game and time are included in the top of the players. Apart from the high rating, the player should have rating deviation (RD) not exceeding 70.

To enter the rating you have to play often and successfully.