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Career ratings for: Diesen, Mark C

  Date of rating  

World Rank Rating +/- Age
12/31/1974#332237063
02/28/1975#380235462
04/30/1975#388235062
06/30/1975#385234962
08/31/1975#376235761
10/31/1975#372235861
12/31/1975#326238370
02/29/1976#303238864
04/30/1976#310238664
06/30/1976#310238764
08/31/1976#304239663
10/31/1976#310239863
12/31/1976#300241669
02/28/1977#304241662
04/30/1977#319241160
06/30/1977#296242058
08/31/1977#268243854
10/31/1977#254244254
12/31/1977#188247953
02/28/1978#242244453
04/30/1978#229245252
06/30/1978#223246052
08/31/1978#182248852
10/31/1978#173248952
12/31/1978#156249953
02/28/1979#182248653
04/30/1979#189248454
06/30/1979#173248954
08/31/1979#177248656
10/31/1979#175248856
12/31/1979#165249956
01/31/1980#171250056
02/29/1980#181249157
03/31/1980#179249057
04/30/1980#181248959
05/31/1980#181249059
06/30/1980#182249258
07/31/1980#182249358
08/31/1980#219247460
09/30/1980#219247460
10/31/1980#219247460
11/30/1980#221247560
12/31/1980#200247861
01/31/1981#206247961
02/28/1981#217246661
03/31/1981#224246461
04/30/1981#229246063
05/31/1981#260244762
06/30/1981#243245763
07/31/1981#247245763
08/31/1981#220246668
09/30/1981#220246568
10/31/1981#217246867
11/30/1981#219246967
12/31/1981#205247568
01/31/1982#205247468
02/28/1982#231246469
03/31/1982#238246369
04/30/1982#242246071
05/31/1982#277244670
06/30/1982#255245672
07/31/1982#258245372
08/31/1982Inactive246777
09/30/1982Inactive246477
10/31/1982Inactive247077
11/30/1982Inactive247077
12/31/1982Inactive247878
01/31/1983Inactive247878
02/28/1983Inactive247078
03/31/1983Inactive246978
04/30/1983Inactive246781
05/31/1983Inactive245480
06/30/1983Inactive246382
07/31/1983Inactive246282
08/31/1983Inactive247288
09/30/1983Inactive247588
10/31/1983Inactive247588
11/30/1983Inactive247688
12/31/1983Inactive248089
01/31/1984Inactive248089
02/29/1984Inactive246989
03/31/1984Inactive247089

These ratings, calculated for Diesen, Mark C, 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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