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Career ratings for: Zhang Pengxiang

  Date of rating  

World Rank Rating +/- Age
08/31/1997#1276237775
09/30/1997#1283237575
10/31/1997#1269237675
11/30/1997#1264237575
12/31/1997#1229237874
01/31/1998#1186238074
02/28/1998#1229237874
03/31/1998#1215238374
04/30/1998#1012240370
05/31/1998#1023240270
06/30/1998#1054239770
07/31/1998#1060239770
08/31/1998Inactive239377
09/30/1998Inactive239177
10/31/1998Inactive239177
11/30/1998Inactive238877
12/31/1998Inactive238976
01/11/1999Inactive238976
01/18/1999Inactive238976
01/25/1999Inactive239076
02/01/1999Inactive239276
02/08/1999Inactive239276
02/15/1999Inactive239276
02/22/1999Inactive239276
03/01/1999Inactive238876
03/08/1999Inactive238976
03/15/1999Inactive238876
03/22/1999Inactive239076
03/29/1999Inactive239076
04/05/1999Inactive239476
04/12/1999Inactive239476
04/19/1999Inactive239476
04/26/1999Inactive239476
05/03/1999Inactive239480
05/10/1999Inactive239380
05/17/1999Inactive239380
05/24/1999Inactive239280
05/31/1999Inactive239380
06/07/1999Inactive239080
06/14/1999Inactive239180
06/21/1999Inactive239080
06/28/1999Inactive239180
07/05/1999Inactive238880
07/12/1999Inactive238980
07/19/1999Inactive238980
07/26/1999Inactive239080
08/02/1999Inactive238980
08/09/1999Inactive239180
08/16/1999Inactive238880
08/23/1999Inactive238980
08/30/1999Inactive238880
09/06/1999Inactive238688
09/13/1999Inactive238688
09/20/1999Inactive238788
09/27/1999Inactive238788
10/04/1999Inactive238688
10/11/1999#962239970
10/18/1999#939240368
10/25/1999#939240368
11/01/1999#527246762
11/08/1999#525246762
11/15/1999#525246762
11/22/1999#525246762
11/29/1999#526246762
12/06/1999#528246462
12/13/1999#593245662
12/20/1999#721243659
12/27/1999#821242056
01/03/2000#780242756
01/10/2000#781242856
01/17/2000#780242956
01/24/2000#777243056
01/31/2000#775243156
02/07/2000#842242055
02/14/2000#682244554
02/21/2000#578246353
02/28/2000#608245952
03/06/2000#607245952
03/13/2000#603245852
03/20/2000#602245852
03/27/2000#607245752
04/03/2000#605245552
04/10/2000#557246452
04/17/2000#529246952
04/24/2000#534246752
05/01/2000#531246952
05/08/2000#525246852
05/15/2000#526247052
05/22/2000#524246952
05/29/2000#523246952
06/05/2000#490247552
06/12/2000#485247452
06/19/2000#485247552
06/26/2000#487247452
07/03/2000#480247552
07/10/2000#493247352
07/17/2000#489247452
07/24/2000#491247452
07/31/2000#490247452
08/07/2000#491247352
08/14/2000#493247352
08/21/2000#494247352
08/28/2000#495247252
09/04/2000#493247252
09/11/2000#532246952
09/18/2000#532246952
09/25/2000#530247052
10/02/2000#531246852
10/09/2000#550246452
10/16/2000#583245652
10/23/2000#584245652
10/30/2000#583245552
11/06/2000#596245352
11/13/2000#621244952
11/20/2000#599245551
11/27/2000#592245651
12/04/2000#594245851
12/11/2000#599245851
12/18/2000#595246051
12/25/2000#593246251
01/01/2001#532247451
01/08/2001#509247751
01/15/2001#508247851
01/22/2001#509247851
01/29/2001#507247951
02/05/2001#495248051
02/12/2001#579246552
02/19/2001#598246352
02/26/2001#582246552
03/05/2001#606246053
03/12/2001#598246053
03/19/2001#597246053
03/26/2001#598246053
04/02/2001#600245953
04/09/2001#602245853
04/16/2001#566246453
04/23/2001#554246653
04/30/2001#559246653
05/07/2001#555246653
05/14/2001#546246753
05/21/2001#545246553
05/28/2001#545246553
06/04/2001#546246553
06/11/2001#530247153
06/18/2001#516247253
06/25/2001#558246452
07/02/2001#552246552
07/09/2001#548246552
07/16/2001#550246452
07/23/2001#542246452
07/30/2001#538246552
08/06/2001#471248052
08/13/2001#495247451
08/20/2001#465248051
08/27/2001#365250050
09/03/2001#363250150
09/10/2001#359250250

These ratings, calculated for Zhang Pengxiang, 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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