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Career ratings for: Arulaid, Alexander

  Date of rating  

World Rank Rating +/- Age
12/31/1945Inactive239084
12/31/1949Inactive243878
06/30/1950Inactive243578
12/31/1950Inactive242689
06/30/1951Inactive243289
06/30/1957Inactive238687
12/31/1957Inactive237587
06/30/1959Inactive243785
12/31/1959Inactive243185
03/31/1960Inactive242985
03/31/1969#196243265
06/30/1969#191243565
09/30/1969#186243665
12/31/1969#184243865
02/28/1970#195243565
04/30/1970#188243173
06/30/1970#188243173
08/31/1970#189243273
10/31/1970#187243573
12/31/1970#193243473
02/28/1971#194243073
04/30/1971Inactive242684
06/30/1971Inactive242784
08/31/1971Inactive242784
10/31/1971Inactive243084
12/31/1971Inactive242784
02/29/1972Inactive243284

These ratings, calculated for Arulaid, Alexander, 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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