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Career ratings for: Pesonen, Pekka

  Date of rating  

World Rank Rating +/- Age
01/31/1997Inactive209980
02/28/1997Inactive209980
03/31/1997Inactive209780
04/30/1997Inactive209680
05/31/1997Inactive209680
06/30/1997Inactive209880
07/31/1997Inactive209880
08/31/1997Inactive209980
09/30/1997Inactive209880
10/31/1997Inactive209880
11/30/1997Inactive209780
12/31/1997Inactive209780
01/31/1998#4622211969
02/28/1998#4638211969
03/31/1998#4664211969
04/30/1998#4691212069
05/31/1998#4712211969
06/30/1998#4770212069
07/31/1998#4793212069
08/31/1998#4866211969
09/30/1998#4919212169
10/31/1998#4971212269
11/30/1998#5030212069
12/31/1998#5080211969
01/11/1999#4762211969
01/18/1999#4771211969
01/25/1999#4783211969
02/01/1999Inactive211279
02/08/1999Inactive211379
02/15/1999Inactive211279
02/22/1999Inactive211279
03/01/1999Inactive211279
03/08/1999Inactive211479
03/15/1999Inactive211379
03/22/1999Inactive211379
03/29/1999Inactive211379
04/05/1999Inactive211279
04/12/1999Inactive211279
04/19/1999Inactive211379
04/26/1999Inactive211379
05/03/1999Inactive211379
05/10/1999Inactive211279
05/17/1999Inactive211279
05/24/1999Inactive211279
05/31/1999Inactive211279
06/07/1999Inactive211379
06/14/1999Inactive211379
06/21/1999Inactive211279
06/28/1999Inactive211279
07/05/1999Inactive211379
07/12/1999Inactive211279
07/19/1999Inactive211379
07/26/1999Inactive211379
08/02/1999Inactive211379
08/09/1999Inactive211479
08/16/1999Inactive211379
08/23/1999Inactive211279
08/30/1999Inactive211379
09/06/1999Inactive211479
09/13/1999Inactive211379
09/20/1999Inactive211479
09/27/1999Inactive211479
10/04/1999Inactive211379
10/11/1999Inactive211379
10/18/1999Inactive211379
10/25/1999Inactive211379
11/01/1999Inactive211479
11/08/1999Inactive211479
11/15/1999Inactive211479
11/22/1999Inactive211479
11/29/1999Inactive211479
12/06/1999Inactive211579
12/13/1999Inactive211479
12/20/1999Inactive211379
12/27/1999Inactive211479
01/03/2000Inactive211479
01/10/2000Inactive211579
01/17/2000Inactive211479
01/24/2000Inactive211579
01/31/2000Inactive211579

These ratings, calculated for Pesonen, Pekka, 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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