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Career ratings for: Long, Peter

  Date of rating  

World Rank Rating +/- Age
11/30/1986Inactive219578
12/31/1986Inactive219578
01/31/1987Inactive219378
02/28/1987Inactive219578
03/31/1987Inactive219578
04/30/1987Inactive218978
05/31/1987Inactive219078
06/30/1987Inactive219978
07/31/1987Inactive220778
08/31/1987Inactive220978
09/30/1987Inactive219978
10/31/1987Inactive220078
11/30/1987Inactive218489
12/31/1987Inactive218489
01/31/1988Inactive218589
02/29/1988Inactive219189
03/31/1988Inactive219189
04/30/1988Inactive218889
05/31/1988Inactive218889
06/30/1988Inactive219689
07/31/1988Inactive220589
08/31/1988Inactive220889
09/30/1988Inactive219889
10/31/1988Inactive219689
10/31/1991Inactive218588
11/30/1991Inactive217989
12/31/1991Inactive217789
01/31/1992Inactive214378
02/29/1992Inactive214678
03/31/1992Inactive218276
04/30/1992Inactive217776
05/31/1992Inactive217776
06/30/1992Inactive218276
07/31/1992Inactive218976
08/31/1992Inactive219176
09/30/1992Inactive218576
10/31/1992Inactive216282
11/30/1992Inactive215383
12/31/1992Inactive215783
01/31/1993Inactive213889
02/28/1993Inactive214089
03/31/1993Inactive217687
04/30/1993Inactive217487
05/31/1993Inactive217387
06/30/1993#2754217874
07/31/1993#2772218174
08/31/1993#2832218274
09/30/1993#2886217874
10/31/1993Inactive215877
11/30/1993Inactive215677
12/31/1993Inactive215677
01/31/1994Inactive214778
02/28/1994Inactive214878
03/31/1994Inactive216478
04/30/1994Inactive216178
05/31/1994Inactive216578
06/30/1994Inactive217285
07/31/1994Inactive217685
08/31/1994Inactive217785
09/30/1994Inactive217185
10/31/1994Inactive214987
11/30/1994Inactive214988
12/31/1994Inactive214988
01/31/1995Inactive214089
02/28/1995Inactive214289
03/31/1995Inactive215789
04/30/1995Inactive215589
05/31/1995Inactive215689

These ratings, calculated for Long, Peter, 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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