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Career ratings for: Safvat, Y.

  Date of rating  

World Rank Rating +/- Age
06/30/1957#260227375
06/30/1958Inactive225986
12/31/1958Inactive219976
06/30/1959#312220275
12/31/1959Inactive219287
03/31/1960Inactive219087
06/30/1960Inactive219185
09/30/1960Inactive219085
09/30/1962Inactive223280
12/31/1962Inactive223581
03/31/1963Inactive223381
06/30/1963Inactive223581
12/31/1964Inactive223479
03/31/1965Inactive224479
06/30/1965Inactive224379
09/30/1965Inactive223681
10/31/1970#451227375
12/31/1970#441227975
02/28/1971#453227275
04/30/1971#415227575
06/30/1971#423227575
08/31/1971#437227575
10/31/1971Inactive226886
12/31/1971Inactive227286
02/29/1972Inactive227486
04/30/1972Inactive227686
06/30/1972Inactive227686
08/31/1972Inactive227786

These ratings, calculated for Safvat, Y., 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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