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Career ratings for: Gudmundsson, Arinbjorn

  Date of rating  

World Rank Rating +/- Age
12/31/1960#254229072
03/31/1961#312229572
06/30/1961#317227972
09/30/1961#321227672
12/31/1961Inactive228682
03/31/1962Inactive228782
06/30/1962Inactive227082
09/30/1962#268232368
12/31/1962#255234271
03/31/1963#258234768
06/30/1963#281232669
09/30/1963Inactive231678
12/31/1963Inactive233482
03/31/1964#269233565
06/30/1964#291231865
09/30/1964#301230567
12/31/1964#300231868
03/31/1965#296233973
06/30/1965#327232074
09/30/1965Inactive230877
12/31/1965Inactive232077
03/31/1966Inactive233384
06/30/1966Inactive231385
09/30/1966Inactive230488
12/31/1966Inactive231488
03/31/1969Inactive229187
06/30/1969Inactive227887
09/30/1969Inactive226687
12/31/1969Inactive223778
02/28/1970Inactive223578
12/31/1970Inactive223488
02/28/1971Inactive223088

These ratings, calculated for Gudmundsson, Arinbjorn, 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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