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Career ratings for: Bircher, Roland

  Date of rating  

World Rank Rating +/- Age
01/31/1997Inactive226085
02/28/1997Inactive226285
03/31/1997Inactive226185
07/31/1997Inactive221676
08/31/1997#3767220373
09/30/1997#3690220773
10/31/1997#3120224971
11/30/1997#3180224471
12/31/1997#3203224371
01/31/1998#2641227470
02/28/1998#2617227570
03/31/1998#2650227670
04/30/1998#2829226569
05/31/1998#2778226969
06/30/1998#2986225467
07/31/1998Inactive221087
08/31/1998Inactive219584
09/30/1998Inactive219983
10/31/1998Inactive224181
11/30/1998Inactive223581
12/31/1998Inactive223481
01/11/1999Inactive223481
01/18/1999Inactive223581
01/25/1999Inactive223581
02/01/1999Inactive226580
02/08/1999Inactive226580
02/15/1999Inactive226580
02/22/1999Inactive226580
03/01/1999Inactive226580
03/08/1999Inactive226680
03/15/1999Inactive226580
03/22/1999Inactive226780
03/29/1999Inactive226780
04/05/1999Inactive226880
04/12/1999Inactive226880
04/19/1999Inactive226980
04/26/1999Inactive226980
05/03/1999Inactive225679
05/10/1999Inactive225579
05/17/1999Inactive225579
05/24/1999Inactive225379
05/31/1999Inactive225479
06/07/1999Inactive225779
06/14/1999Inactive225879
06/21/1999Inactive225779
06/28/1999Inactive225879
07/05/1999Inactive224477
07/12/1999Inactive224577
07/19/1999Inactive224677
07/26/1999Inactive224677
07/10/2000Inactive224088
07/17/2000Inactive224088
07/24/2000Inactive224088
07/31/2000Inactive224088

These ratings, calculated for Bircher, Roland, 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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