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Career ratings for: Zaid, Leonid D

  Date of rating  

World Rank Rating +/- Age
02/28/1974Inactive249979
04/30/1974Inactive249779
06/30/1974Inactive249779
08/31/1974Inactive250079
10/31/1974Inactive249183
12/31/1974Inactive249183
02/28/1975Inactive241079
04/30/1975Inactive240979
06/30/1975Inactive240879
08/31/1975Inactive241079
10/31/1975Inactive240781
12/31/1975Inactive241281
01/31/1986Inactive238977
02/28/1986Inactive239177
03/31/1986Inactive239377
04/30/1986Inactive239077
05/31/1986Inactive238877
06/30/1986Inactive238177
07/31/1986#542239574
08/31/1986#543239174
09/30/1986#537239574
10/31/1986#525239974
11/30/1986#511240374
12/31/1986#516240574
01/31/1987Inactive238188
02/28/1987Inactive238588
03/31/1987Inactive238488
04/30/1987Inactive238088
05/31/1987Inactive237888
06/30/1987Inactive237488
07/31/1987Inactive238585
08/31/1987Inactive238385
09/30/1987Inactive238585
10/31/1987Inactive238985
11/30/1987Inactive239285
12/31/1987Inactive239385
01/31/1988#767235875
02/29/1988#757236475
03/31/1988#761236375
04/30/1988#770236175
05/31/1988#775235875
06/30/1988#800235475
07/31/1988#770236374
08/31/1988#790236374
09/30/1988#782236474
10/31/1988#776236674
11/30/1988#781237074
12/31/1988#801237374
01/31/1989Inactive235686
02/28/1989Inactive235986
03/31/1989Inactive235986
04/30/1989Inactive235786
05/31/1989Inactive235586
06/30/1989Inactive234886
07/31/1989Inactive235785
08/31/1989Inactive235885
09/30/1989Inactive236085
10/31/1989Inactive236285
11/30/1989Inactive236685
12/31/1989Inactive237085
08/31/1991Inactive236985
09/30/1991Inactive237085
10/31/1991Inactive237385
11/30/1991Inactive237585
12/31/1991Inactive237685

These ratings, calculated for Zaid, Leonid D, 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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