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Career ratings for: Ivanov, MD.

  Date of rating  

World Rank Rating +/- Age
01/31/1991#689241473
02/28/1991#677241773
03/31/1991#682241773
04/30/1991#699241973
05/31/1991#708241873
06/30/1991#760240973
07/31/1991#756241273
08/31/1991#770241373
09/30/1991#769241273
10/31/1991#762241273
11/30/1991#764241373
12/31/1991#740241773
01/31/1992Inactive241083
02/29/1992Inactive241583
03/31/1992Inactive241583
04/30/1992Inactive241283
05/31/1992Inactive241083
06/30/1992Inactive240083
07/31/1992Inactive240583
08/31/1992Inactive240583
09/30/1992Inactive240583
10/31/1992Inactive240883
11/30/1992Inactive240783
12/31/1992Inactive241483

These ratings, calculated for Ivanov, MD., 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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