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Career ratings for: Duchov, A.

  Date of rating  

World Rank Rating +/- Age
01/31/1992#2198222375
01/31/1993Inactive221886
08/31/1994Inactive224683
09/30/1994Inactive224683
10/31/1994Inactive224683
11/30/1994Inactive225483
12/31/1994Inactive225483
01/31/1995Inactive221185
02/28/1995Inactive223986
03/31/1995Inactive223886
04/30/1995Inactive224486
05/31/1995Inactive224386
06/30/1995Inactive224286
07/31/1995Inactive224386
01/31/1996#2592227972
02/29/1996#2238230572
03/31/1996#2250230472
04/30/1996#2182230772
05/31/1996#2192230672
06/30/1996#2196230472
07/31/1996#2167230572
08/31/1996#2202230573
09/30/1996#2205230473
10/31/1996#2206230673
11/30/1996#2125231073
12/31/1996#2117231273
01/31/1997Inactive227282
02/28/1997Inactive229782
03/31/1997Inactive229682
04/30/1997Inactive230082
05/31/1997Inactive229882
06/30/1997Inactive229782
07/31/1997Inactive229982
08/31/1997Inactive229884
09/30/1997Inactive229784
10/31/1997Inactive229984
11/30/1997Inactive230384
12/31/1997Inactive230384

These ratings, calculated for Duchov, A., 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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