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Career ratings for: Ibraev, Nurlan

  Date of rating  

World Rank Rating +/- Age
07/31/1997#4118217772
08/31/1997#4099218072
09/30/1997#4086218072
10/31/1997#4609214270
11/30/1997#4629214070
12/31/1997#4655214170
01/31/1998#4295215770
02/28/1998#3975218474
03/31/1998#3435222370
04/30/1998#3451222570
05/31/1998#3488222271
06/30/1998#3406222770
07/31/1998Inactive217182
08/31/1998Inactive217282
09/30/1998Inactive217382
10/31/1998Inactive213780
11/30/1998Inactive213380
12/31/1998Inactive213380
01/11/1999Inactive213380
01/18/1999Inactive213380
01/25/1999Inactive213380
02/01/1999Inactive214980
02/08/1999Inactive214980
02/15/1999Inactive214980
02/22/1999Inactive214980
03/01/1999Inactive217584
03/08/1999Inactive217684
03/15/1999Inactive217584
03/22/1999Inactive217684
03/29/1999Inactive217684
04/05/1999Inactive221580
04/12/1999Inactive221580
04/19/1999Inactive221580
04/26/1999Inactive221580
05/03/1999Inactive221680
05/10/1999Inactive221580
05/17/1999Inactive221580
05/24/1999Inactive221480
05/31/1999Inactive221480
06/07/1999Inactive221181
06/14/1999Inactive221281
06/21/1999Inactive221181
06/28/1999Inactive221281
07/05/1999Inactive221880
07/12/1999Inactive221980
07/19/1999Inactive221980
07/26/1999Inactive222080

These ratings, calculated for Ibraev, Nurlan, 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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