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Career ratings for: Olivera, Alfredo

  Date of rating  

World Rank Rating +/- Age
12/31/1939Inactive233683
12/31/1941Inactive233584
12/31/1948#128221463
12/31/1949#171221172
06/30/1950#210220872
12/31/1950Inactive219882
06/30/1951Inactive220482
06/30/1953Inactive220084
12/31/1953Inactive218887
06/30/1956#219220563
12/31/1956#234220163
06/30/1957#284220871
12/31/1957#266220271
06/30/1958#260217264
12/31/1958#285216464
06/30/1959#324217670
12/31/1959#307216870
03/31/1960#367215167
06/30/1960#291215274
09/30/1960#293215174
12/31/1960#330214374
03/31/1961Inactive215276
06/30/1961Inactive215484
09/30/1961Inactive215184
12/31/1961Inactive214784
03/31/1962Inactive215187
03/31/1964#409216161
06/30/1964#407216461
09/30/1964#396216461
12/31/1964#437216261
03/31/1965#464217468
06/30/1965#465217469
09/30/1965#464217569
12/31/1965#427217269
03/31/1966Inactive217478
06/30/1966Inactive217478
09/30/1966Inactive217878
12/31/1966#475217575
03/31/1967Inactive219278
06/30/1967Inactive217683
09/30/1967Inactive219778
12/31/1967Inactive217286
03/31/1968Inactive219089
09/30/1968Inactive219189

These ratings, calculated for Olivera, Alfredo, 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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