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Career ratings for: Ahman, Ernst

  Date of rating  

World Rank Rating +/- Age
03/31/1960#309226368
06/30/1960#257225368
09/30/1960#258225368
12/31/1960#278225468
03/31/1961Inactive225777
06/30/1961Inactive224978
09/30/1961Inactive224778
12/31/1961Inactive225078
03/31/1962Inactive224988
06/30/1962Inactive224189
09/30/1962Inactive224089
12/31/1962Inactive224489
09/30/1969#564215075
12/31/1969#546212173
02/28/1970#646211873
04/30/1970#546211571
06/30/1970#540211771
08/31/1970#547211871
10/31/1970Inactive214986
12/31/1970Inactive211983
02/28/1971Inactive211583
04/30/1971Inactive211181
06/30/1971Inactive211281
08/31/1971Inactive211281

These ratings, calculated for Ahman, Ernst, 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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