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Career ratings for: Sigurjonsson, Johann O

  Date of rating  

World Rank Rating +/- Age
06/30/1968#526213867
09/30/1968#537213467
12/31/1968#559213367
03/31/1969#580212665
06/30/1969#568214172
09/30/1969#571214172
12/31/1969#533215368
02/28/1970#619215068
04/30/1970#543211974
06/30/1970Inactive213582
08/31/1970Inactive213682
10/31/1970Inactive213982
12/31/1970Inactive215178
02/28/1971Inactive214778
04/30/1971Inactive211484
12/31/1971Inactive214289
02/29/1972Inactive214489
02/28/1982Inactive212778
03/31/1982Inactive212878
04/30/1982#803211175
05/31/1982#802210875
06/30/1982#825211175
07/31/1982#823211475
08/31/1982Inactive210878
09/30/1982Inactive210578
10/31/1982Inactive212778
11/30/1982Inactive212778
12/31/1982Inactive212778
01/31/1983#853210475
02/28/1983Inactive212589
03/31/1983Inactive212689
04/30/1983Inactive210686
05/31/1983Inactive210886
06/30/1983Inactive210886
07/31/1983Inactive210686
08/31/1983Inactive210189
09/30/1983Inactive210389
10/31/1983Inactive212589
11/30/1983Inactive212589
12/31/1983Inactive212289
01/31/1984Inactive209986

These ratings, calculated for Sigurjonsson, Johann O, 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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