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Career ratings for: Boesken, Clemens Peter

  Date of rating  

World Rank Rating +/- Age
10/31/1987Inactive221677
11/30/1987Inactive221477
12/31/1987Inactive221477
01/31/1988Inactive221277
02/29/1988Inactive221977
03/31/1988Inactive221877
04/30/1988Inactive221577
05/31/1988Inactive221377
06/30/1988Inactive220977
07/31/1988Inactive221177
08/31/1988Inactive222578
09/30/1988#1181226875
10/31/1988Inactive221478
11/30/1988Inactive221478
12/31/1988Inactive221878
01/31/1989Inactive221378
02/28/1989Inactive221578
03/31/1989Inactive221678
04/30/1989Inactive221178
05/31/1989Inactive221078
06/30/1989Inactive220578
07/31/1989Inactive220778
08/31/1989Inactive222078
09/30/1989Inactive225276
10/31/1989Inactive221089
11/30/1989Inactive221089
12/31/1989Inactive221589
01/31/1990Inactive220989
02/28/1990Inactive221189
03/31/1990Inactive221089
04/30/1990Inactive220689
05/31/1990Inactive220389
06/30/1990Inactive220089
07/31/1990Inactive220189
08/31/1990Inactive221589
09/30/1990Inactive224687

These ratings, calculated for Boesken, Clemens Peter, 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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