Ratings More Info

Q: My understanding has been that our ratings can change even if we don't play. In the Md Open recently, I beat , my rating rose to , and since then haven't played any tournaments. played in the recent tournament and won all his games and jumped from to , but my rating remained the same. Is this to be expected?

A: Yes, it is to be expected. We do not have a system such as Whole History Rating which updates all ratings each time games are played. Rather we have a system that updates the ratings of only those individuals that play in newly rated games. BUT PLEASE NOTE that when we receive a set of results for rated games, we rate those games and all games played at the date and later. For example:

  1. On 7/1/2013, receive xxxx20130615, a tournament played on 6/15/2013, these games will be rated and the players ratings updated
  2. On 7/10/2013, receive and rate yyyy20130622, a tournament played on 6/22/2013, these games will be rated and the players ratings updated. Any players that played on both xxxx20130615 and yyyy20130622 will have their ratings updated once for each tournament
  3. On 7/20/2013, receive and zzzz20130531, a tournament played on 5/31/2013, these games will be rated and the players ratings updated. THEN xxxx20130622 will be rated using the players ratings that existed before this tournament (xxxx20130622) was played, including changes due to zzzz20130531. THEN yyyy20130622 will be rated using the players ratings that existed as a result of xxxx20130615 for any players that played in zzzz20130531 and/or yyyy20130622.

As a result, a person might not play for a month, yet their rating change because of the delayed submission of a tournament that they did not play in at all. Example

A played in yyyy20130622 against B
C played in zzzz20130531 against B
A and B are rated on 7/10/2013 based upon xxx20130615
C and B are rated based upon zzzz20130531
when A is re-rated as a result of zzzz20130531 being rated, A rating may change because B's rating changed.