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Career ratings for: Fred, Aatos

  Date of rating  

World Rank Rating +/- Age
12/31/1947Inactive233679
06/30/1951#186229270
12/31/1951#165227170
06/30/1952Inactive228180
12/31/1952#181228568
06/30/1953#161230271
12/31/1953Inactive228077
06/30/1954Inactive229381
12/31/1954#195230272
06/30/1955#212231673
12/31/1955Inactive229783
06/30/1956Inactive230684
12/31/1956Inactive228880
06/30/1957Inactive229677
06/30/1958Inactive228288
12/31/1958Inactive225876
06/30/1959#279225775
12/31/1959Inactive225086
03/31/1960Inactive224986
06/30/1960Inactive224586
09/30/1960Inactive224586
12/31/1960Inactive225488
03/31/1961Inactive224982
06/30/1961Inactive225082
09/30/1961Inactive224782
12/31/1964Inactive230288
03/31/1965Inactive229788
06/30/1965Inactive229188
09/30/1965Inactive229188

These ratings, calculated for Fred, Aatos, 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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