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Career ratings for: Quesada, Roberto

  Date of rating  

World Rank Rating +/- Age
06/30/1952#170229466
12/31/1952#179228866
06/30/1953#167229175
12/31/1953#160228275
06/30/1954Inactive228286
12/31/1954Inactive227686
04/30/2001#2556225465
05/07/2001#2579225565
05/14/2001#2557225665
05/21/2001#2554225565
05/28/2001#2473226165
06/04/2001#2210228463
06/11/2001#1945230662
06/18/2001#1902231162
06/25/2001#1899231162
07/02/2001#1870231362
07/09/2001#1871231362
07/16/2001#1831231762
07/23/2001#1835231662
07/30/2001#1834231662
08/06/2001#1841231762
08/13/2001#1827231862
08/20/2001#1833231862
08/27/2001#1843231862
09/03/2001#1850231962
09/10/2001#1849231962

These ratings, calculated for Quesada, Roberto, 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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