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Career ratings for: Thomas, Richard

  Date of rating  

World Rank Rating +/- Age
03/31/1969Inactive220781
06/30/1969Inactive220881
09/30/1969Inactive221482
12/31/1969Inactive222382
02/28/1970Inactive222082
08/31/1974Inactive225389
10/31/1974Inactive225689
12/31/1974Inactive225289
02/28/1975Inactive225489
04/30/1975Inactive224889
06/30/1975Inactive224689
08/31/1977#484231174
10/31/1977#476231574
12/31/1977#482231274
02/28/1978#486231074
04/30/1978#489230374
06/30/1978#528230074
08/31/1978Inactive230385
10/31/1978Inactive230885
12/31/1978Inactive230485
02/28/1979Inactive230385
04/30/1979Inactive229985
06/30/1979Inactive229485
01/31/1998Inactive221180
02/28/1998Inactive221080
03/31/1998Inactive221180
04/30/1998Inactive221180
05/31/1998Inactive221080
06/30/1998Inactive221380
07/31/1998Inactive221180
08/31/1998Inactive218680
09/30/1998Inactive218480
10/31/1998Inactive218980
11/30/1998Inactive218080
12/31/1998Inactive217978
01/11/1999Inactive217978
01/18/1999Inactive217978
01/25/1999Inactive218078
01/03/2000Inactive217789
01/10/2000Inactive217889
01/17/2000Inactive217889
01/24/2000Inactive217989
01/31/2000Inactive218089

These ratings, calculated for Thomas, Richard, incorporate all games (against rated opponents) played in the year before the "Date of rating", along with the ratings that were already calculated one year previously. If a player has an insufficient number of games in recent years, there may be gaps in the list, even though you may see ratings listed on previous and/or subsequent dates. Whenever a player has played no rated games for three straight years, or dies, they are removed from the list.

Definition of columns in the above list:

Date of rating is the "effective date" of the rating. The rating calculation does not include any games occurring after the "Date of rating".

World Rank refers to the player's world rank on that date.

Rating is the calculated rating for the player, as of the "Date of Rating". This represents the player's estimated strength on the following day.

+/- is the standard deviation of the player's rating estimate. It is based on a geometric average of the number of rated games played in past years. Players who play very frequently will have a smaller +/- value, indicating a greater confidence in the accuracy of their rating. Players whose +/- value exceeds 76 are classified as "Inactive" due to their infrequent play against rated opponents. Mathematically, a player's rating is an estimate of their exact strength on the day after the "Date of Rating". The +/- value represents the standard deviation of that estimate; the player's true strength on that date should be within one standard deviation of their calculated rating approximately 68% of the time, and within two standard deviations of their calculated rating approximately 95% of the time.

Age is the player's exact age in years, on the "Date of Rating". If a player's age is displayed as a link, that means that this rating was active at the time of their next birthday. Click on the link to see the sorted list of all players' ratings on their birthdays when turning that same age.

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