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Career ratings for: Feuerstein, Arthur William

  Date of rating  

World Rank Rating +/- Age
06/30/1957#197237971
12/31/1957#209233672
06/30/1958Inactive236481
12/31/1958Inactive232482
02/29/1972#529222968
04/30/1972#504222968
06/30/1972#501223068
08/31/1972#500223068
10/31/1972#536222968
12/31/1972#522223468
02/28/1973Inactive222378
04/30/1973Inactive222278
06/30/1973Inactive222478
08/31/1973Inactive222578
10/31/1973Inactive222578
12/31/1973Inactive222978
02/28/1974Inactive221789
04/30/1974Inactive221489
06/30/1974Inactive221489
08/31/1974Inactive221589
10/31/1974Inactive221289
12/31/1974Inactive221789
02/28/1977#570218268
04/30/1977#595217868
06/30/1977#581217868
08/31/1977#585218168
10/31/1977#588217967
12/31/1977#591218167
02/28/1978Inactive217478
04/30/1978Inactive217278
06/30/1978Inactive217278
08/31/1978Inactive217578
10/31/1978Inactive217476
12/31/1978Inactive217376
02/28/1979Inactive216889
04/30/1979Inactive216889
06/30/1979Inactive216489
08/31/1979Inactive216689
10/31/1979Inactive216687
12/31/1979Inactive216987
01/31/1980Inactive217187
07/23/2001Inactive214486
07/30/2001Inactive214586
08/06/2001Inactive214181
08/13/2001Inactive214181
08/20/2001Inactive214181
08/27/2001Inactive214181
09/03/2001Inactive214181
09/10/2001Inactive214181

These ratings, calculated for Feuerstein, Arthur William, 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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