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Career ratings for: Petrosian, Karen

  Date of rating  

World Rank Rating +/- Age
01/31/1991Inactive230980
02/28/1991Inactive230880
03/31/1991Inactive230980
04/30/1991Inactive231380
05/31/1991#1181234971
06/30/1991#1264234168
07/31/1991#1236234468
08/31/1991#1297233968
09/30/1991#1268234268
10/31/1991#1596229670
11/30/1991#1583229770
12/31/1991#1557230070
01/31/1992Inactive228476
02/29/1992Inactive228476
03/31/1992Inactive228576
04/30/1992Inactive228676
05/31/1992Inactive234181
06/30/1992Inactive233277
07/31/1992Inactive233677
08/31/1992Inactive233077
09/30/1992Inactive233477
10/31/1992Inactive229280
11/30/1992Inactive229080
12/31/1992Inactive229780
01/31/1993Inactive227886
02/28/1993Inactive227886
03/31/1993Inactive227986
04/30/1993Inactive228286
06/30/1993Inactive232988
07/31/1993Inactive233188
08/31/1993Inactive232488
09/30/1993Inactive232888
10/31/1993#1402234669
11/30/1993#1404234869
12/31/1993#1367235169
01/31/1994#1037239162
02/28/1994#1041239062
03/31/1994#1036238962
04/30/1994#1013239162
05/31/1994#736243063
06/30/1994#787242162
07/31/1994#710243562
08/31/1994#723243162
09/30/1994#716243262
10/31/1994#1097238465
11/30/1994#1102238765
12/31/1994#1070238965
01/31/1995#1153238270
02/28/1995#1159238170
03/31/1995#1209237469
04/30/1995#1194237769
05/31/1995#878241369
06/30/1995#953240569
07/31/1995#933240859
08/31/1995#1099239356
09/30/1995#1085239356
10/31/1995#1278237755
11/30/1995#1362236755
12/31/1995#1344237055
01/31/1996#1617235054
02/29/1996#1622235054
03/31/1996#1606235254
04/30/1996#1568235454
05/31/1996#1347237354
06/30/1996#1463236254
07/31/1996#1351237055
08/31/1996#1264238057
09/30/1996#1271237957
10/31/1996#1568235258
11/30/1996#1660234358
12/31/1996#1655234658
01/31/1997#1603234959
02/28/1997#1629234959
03/31/1997#1610235159
04/30/1997#1569235459
05/31/1997#1347237160
06/30/1997#1455236260
07/31/1997#1367237061
08/31/1997#1236238063
09/30/1997#1237237863
10/31/1997#1564235165
11/30/1997#1660234265
12/31/1997#1642234365
01/31/1998#1586234566
02/28/1998#1585234667
03/31/1998#1576235067
04/30/1998#1541235467
05/31/1998#1323237367
06/30/1998#1444236367
07/31/1998#1345237169
08/31/1998#1223237971
09/30/1998#1218237871
10/31/1998#1571234974
11/30/1998#1661233974
12/31/1998#1646234074
01/11/1999Inactive234174
01/18/1999Inactive234174
01/25/1999Inactive234174
02/01/1999Inactive234375
02/08/1999Inactive234375
02/15/1999Inactive234375
02/22/1999Inactive234475
03/01/1999Inactive234276
03/08/1999Inactive234376
03/15/1999Inactive234276
03/22/1999Inactive234476
03/29/1999Inactive234476
04/05/1999Inactive234876
04/12/1999Inactive234876
04/19/1999Inactive234876
04/26/1999Inactive234876
05/03/1999Inactive235176
05/10/1999Inactive235076
05/17/1999Inactive235076
05/24/1999Inactive234976
05/31/1999Inactive234976
06/07/1999Inactive236776
06/14/1999Inactive236776
06/21/1999Inactive236676
06/28/1999Inactive236776
07/05/1999Inactive235976
07/12/1999Inactive236076
07/19/1999Inactive236176
07/26/1999Inactive236176
08/02/1999Inactive237078
08/09/1999Inactive237178
08/16/1999Inactive236878
08/23/1999Inactive237078
08/30/1999Inactive236978
09/06/1999Inactive237981
09/13/1999Inactive237881
09/20/1999Inactive237981
09/27/1999Inactive237981
10/04/1999Inactive237981
10/11/1999Inactive237981
10/18/1999Inactive238081
10/25/1999Inactive238081
11/01/1999Inactive235284
11/08/1999Inactive235184
11/15/1999Inactive235284
11/22/1999Inactive235184
11/29/1999Inactive235284
12/06/1999Inactive234284
12/13/1999Inactive234384
12/20/1999Inactive234284
12/27/1999Inactive234384
01/03/2000Inactive234684
01/10/2000Inactive234784
01/17/2000Inactive234884
01/24/2000Inactive234884
01/31/2000Inactive234984
02/07/2000Inactive235186
02/14/2000Inactive235186
02/21/2000Inactive235186
02/28/2000Inactive235286
03/06/2000Inactive235287
03/13/2000Inactive235187
03/20/2000Inactive235187
03/27/2000Inactive235087
04/03/2000Inactive234987
04/10/2000Inactive235087
04/17/2000Inactive235087
04/24/2000Inactive234987
05/01/2000Inactive235087
05/08/2000Inactive235187
05/15/2000Inactive235287
05/22/2000Inactive235187
05/29/2000Inactive235287
06/05/2000Inactive235187
06/12/2000Inactive237087
06/19/2000Inactive237087
06/26/2000Inactive237087
07/03/2000Inactive237087
07/10/2000Inactive236287
07/17/2000Inactive236287
07/24/2000Inactive236287
07/31/2000Inactive236287
08/07/2000Inactive237089
08/14/2000Inactive237089
08/21/2000Inactive237089
08/28/2000Inactive237089
09/04/2000Inactive237089

These ratings, calculated for Petrosian, Karen, 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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