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Career ratings for: Kogan, Boris

  Date of rating  

World Rank Rating +/- Age
02/28/1971Inactive238883
04/30/1971Inactive239184
06/30/1971Inactive239084
08/31/1971Inactive239184
10/31/1971Inactive239484
12/31/1971Inactive238784
04/30/1981#385240173
05/31/1981#379240173
06/30/1981#380240673
07/31/1981#266244960
08/31/1981#267244860
09/30/1981#265244760
10/31/1981#280244660
11/30/1981#280244760
12/31/1981#269245060
01/31/1982#269244960
02/28/1982#171249657
03/31/1982#170249757
04/30/1982#160250558
05/31/1982#161250458
06/30/1982#156250858
07/31/1982#197248061
08/31/1982#200248261
09/30/1982#201247961
10/31/1982#208248261
11/30/1982#208248261
12/31/1982#205248561
01/31/1983#197248561
02/28/1983#181249464
03/31/1983#183249564
04/30/1983#173250465
05/31/1983#172250465
06/30/1983#171250765
07/31/1983#263246460
08/31/1983#260246359
09/30/1983#273246659
10/31/1983#279246359
11/30/1983#278246559
12/31/1983#274246359
01/31/1984#268246559
02/29/1984#249246960
03/31/1984#255247060
04/30/1984#203249758
05/31/1984#202249858
06/30/1984#203250258
07/31/1984#169251756
08/31/1984#175251655
09/30/1984#161252555
10/31/1984#162252655
11/30/1984#164252555
12/31/1984#161252555
01/31/1985#162252655
02/28/1985#150253155
03/31/1985#155252955
04/30/1985#179251656
05/31/1985#175251656
06/30/1985#175251956
07/31/1985#181251861
08/31/1985#184251761
09/30/1985#170252561
10/31/1985#168253256
11/30/1985#160253556
12/31/1985#159253356
01/31/1986#178252656
02/28/1986#180252556
03/31/1986#179252756
04/30/1986#189251556
05/31/1986#192251756
06/30/1986#190251756
07/31/1986#203251158
08/31/1986#209250958
09/30/1986#195251658
10/31/1986#235249655
11/30/1986#238249755
12/31/1986#259248955
01/31/1987#260249055
02/28/1987#248249155
03/31/1987#243249155
04/30/1987#276248056
05/31/1987#276248056
06/30/1987#267248356
07/31/1987#274248057
08/31/1987#266248057
09/30/1987#258248357
10/31/1987#264248361
11/30/1987#350245656
12/31/1987#341245756
01/31/1988#348246356
02/29/1988#343246856
03/31/1988#335246956
04/30/1988#359246456
05/31/1988#358246356
06/30/1988#356246556
07/31/1988#361246357
08/31/1988#379246357
09/30/1988#367246657
10/31/1988#376246358
11/30/1988#383246262
12/31/1988#382246562
01/31/1989#379246862
02/28/1989#366247162
03/31/1989#363247362
04/30/1989#392246662
05/31/1989#395246662
06/30/1989#391246662
07/31/1989#396246363
08/31/1989#406246563
09/30/1989#396246963
10/31/1989#404246665
11/30/1989#415246570
12/31/1989#410246970
01/31/1990#413247170
02/28/1990#401247370
03/31/1990#393247370
04/30/1990#421246870
05/31/1990#414246470
06/30/1990#400246970
07/31/1990#410246571
08/31/1990#412246771
09/30/1990#407247071
10/31/1990#414246874
11/30/1990Inactive246380
12/31/1990Inactive246580
01/31/1991Inactive246780
02/28/1991Inactive247080
03/31/1991Inactive247180
04/30/1991Inactive246880
05/31/1991Inactive247080
06/30/1991Inactive247280
07/31/1991Inactive246981
08/31/1991Inactive247081
09/30/1991Inactive247381
10/31/1991Inactive247085
10/31/1996#1030240375
11/30/1996#1054239975
12/31/1996#1055240175
01/31/1997#896241972
02/28/1997#892242172
03/31/1997#876242172
04/30/1997#916241872
05/31/1997#911241772
06/30/1997#911241872
07/31/1997#922241673
08/31/1997#901241873
09/30/1997#867241973
10/31/1997Inactive240386
11/30/1997Inactive239886
12/31/1997Inactive239886
01/31/1998Inactive241583
02/28/1998Inactive241783
03/31/1998Inactive242083
04/30/1998Inactive241883
05/31/1998Inactive241883
06/30/1998Inactive241983
07/31/1998Inactive241783
08/31/1998Inactive241783
09/30/1998Inactive241883
02/01/1999Inactive239786
02/08/1999Inactive237277
02/15/1999Inactive237277
02/22/1999Inactive237377
03/01/1999Inactive237377
03/08/1999Inactive237477
03/15/1999Inactive237477
03/22/1999Inactive237577
03/29/1999Inactive237577
04/05/1999Inactive237977
04/12/1999Inactive237977
04/19/1999Inactive238077
04/26/1999Inactive238077
05/03/1999Inactive237677
05/10/1999Inactive237577
05/17/1999Inactive237577
05/24/1999#1846231668
05/31/1999#1856231768
06/07/1999#1870231568
06/14/1999#1867231668
06/21/1999#1873231568
06/28/1999#1876231668
07/05/1999#1845231868
07/12/1999#1847231968
07/19/1999#1845231968
07/26/1999#1851232068
08/02/1999#1846231968
08/09/1999#1852232068
08/16/1999#1855231768
08/23/1999#1863231968
08/30/1999#1867231868
09/06/1999#1870231768
09/13/1999#1873231768
09/20/1999#1877231768
09/27/1999#1880231768
10/04/1999#1836231968
10/11/1999#1838231968
10/18/1999#1854231968
10/25/1999#1850231968
11/01/1999#2316228369
11/08/1999#2319228369
11/15/1999#2327228369
11/22/1999#2326228369
11/29/1999#2334228369
12/06/1999#2344227969
12/13/1999#2343228069
12/20/1999#2345227969
12/27/1999#2352228069
01/03/2000#2353228269
01/10/2000#2359228269
01/17/2000#2364228369
01/24/2000#2362228469
01/31/2000#2362228569
02/07/2000#1858231570
02/14/2000#1779232272
02/21/2000#1785232372
02/28/2000#1781232472
03/06/2000#1760232572
03/13/2000#1761232472
03/20/2000#1760232472
03/27/2000#1765232372
04/03/2000#1764232172
04/10/2000#1743232372
04/17/2000#1754232372
04/24/2000#1758232272
05/01/2000#1761232272
05/08/2000#1810231772
05/15/2000#1874231568
05/22/2000#1876231368
05/29/2000#1851231672
06/05/2000#1851231572
06/12/2000#1851231572
06/19/2000#1872231572
06/26/2000#1866231572
07/03/2000#1873231572
07/10/2000#1850231672
07/17/2000#1854231772
07/24/2000#1856231772
07/31/2000#1860231772
08/07/2000#1850231572
08/14/2000#1855231672
08/21/2000#1857231672
08/28/2000#1857231672
09/04/2000#1855231672
09/11/2000#1860231672
09/18/2000#1859231672
09/25/2000#1862231672
10/02/2000#1864231572
10/09/2000#1818231672
10/16/2000#1818231572
10/23/2000#1826231472
10/30/2000#1831231472
11/06/2000#2220228173
11/13/2000#2234228173
11/20/2000#2257228473
11/27/2000#2259228473
12/04/2000#2258228673
12/11/2000#2263228473
12/18/2000#2267228573
12/25/2000#2268228673
01/01/2001#2273228773
01/08/2001#2262228773
01/15/2001#2267228773
01/22/2001#2271228773
01/29/2001#2275228873
02/05/2001#2250228973
02/12/2001#1857231674
02/19/2001#1781232375
02/26/2001#1776232275
03/05/2001#1775232275
03/12/2001#1760232375
03/19/2001#1767232275
03/26/2001#1771232275
04/02/2001#1769232275
04/09/2001#1776232075
04/16/2001#1771232275
04/23/2001#1773232075
04/30/2001#1784232075
05/07/2001#1791231975
05/14/2001#1847231675
05/21/2001Inactive231578
05/28/2001Inactive231478
06/04/2001Inactive231682
06/11/2001Inactive231882
06/18/2001Inactive231882
06/25/2001Inactive231882
07/02/2001Inactive231982
07/09/2001Inactive231882
07/16/2001Inactive232082
07/23/2001Inactive231982
07/30/2001Inactive231982
08/06/2001Inactive232082
08/13/2001Inactive231982
08/20/2001Inactive232082
08/27/2001Inactive231982
09/03/2001Inactive232082
09/10/2001Inactive232082

These ratings, calculated for Kogan, Boris, 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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