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Career ratings for: Zarubin, O.

  Date of rating  

World Rank Rating +/- Age
01/31/1981#508235475
02/28/1981#476235575
03/31/1981#477235775
04/30/1981#488235875
05/31/1981#490235675
06/30/1981#501235875
07/31/1981#512235875
08/31/1981#501235975
09/30/1981#483236775
10/31/1981#484236875
11/30/1981#491236775
12/31/1981#488236675
01/31/1982#222246767
02/28/1982#217247067
03/31/1982#213247267
04/30/1982#211247467
05/31/1982#214247167
06/30/1982#214247267
07/31/1982#212247167
08/31/1982#217247567
09/30/1982#203247967
10/31/1982#201248467
11/30/1982#206248367
12/31/1982#208248467
01/31/1983Inactive246376
02/28/1983Inactive246776
03/31/1983Inactive246976
04/30/1983Inactive247376
05/31/1983Inactive247176
06/30/1983Inactive247276
07/31/1983Inactive247176
08/31/1983Inactive247276
09/30/1983Inactive248276
10/31/1983Inactive248276
11/30/1983Inactive248176
12/31/1983Inactive247976
01/31/1984Inactive245987
02/29/1984Inactive246187
03/31/1984Inactive246487
04/30/1984Inactive246887
05/31/1984Inactive246887
06/30/1984Inactive246887
07/31/1984Inactive246987
08/31/1984Inactive247187
09/30/1984Inactive247887
10/31/1984Inactive248187
11/30/1984Inactive247987
12/31/1984Inactive247987

These ratings, calculated for Zarubin, O., 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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