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Career ratings for: Lewis, James E

  Date of rating  

World Rank Rating +/- Age
06/30/1987Inactive226681
07/31/1987Inactive226481
08/31/1987Inactive225481
09/30/1987Inactive225481
06/30/1989Inactive231084
07/31/1989Inactive230984
08/31/1989Inactive230284
09/30/1989Inactive230484
10/31/1989Inactive231785
11/30/1990Inactive229579
12/31/1990Inactive229679
01/31/1991Inactive230779
02/28/1991Inactive231079
03/31/1991Inactive232175
04/30/1991Inactive232175
05/31/1991Inactive232375
06/30/1991Inactive229676
07/31/1991#1603229173
08/31/1991#1660228673
09/30/1991#1646228873
10/31/1991#1553230373
11/30/1991Inactive228679
12/31/1991Inactive228679
01/31/1992Inactive230383
02/29/1992Inactive230783
03/31/1992Inactive231881
04/30/1992Inactive231281
05/31/1992Inactive231381
06/30/1992Inactive228681
07/31/1992Inactive228484
08/31/1992Inactive227884
09/30/1992Inactive228184
10/31/1992Inactive229884

These ratings, calculated for Lewis, James E, 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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