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Career ratings for: Schiffer, Karl Josef

  Date of rating  

World Rank Rating +/- Age
02/28/1970#288238662
04/30/1970#328234664
06/30/1970#272238663
08/31/1970#271238763
10/31/1970#275238763
12/31/1970#266239263
02/28/1971#286238171
04/30/1971#329234173
06/30/1971#281238568
08/31/1971#286238568
10/31/1971#211242259
12/31/1971#209241958
02/29/1972#239242361
04/30/1972#283239862
06/30/1972#230242661
08/31/1972#232242761
10/31/1972#239242166
12/31/1972#243241865
02/28/1973#258241769
04/30/1973#304239070
06/30/1973#256242069
08/31/1973#256242169
10/31/1973#259241775
12/31/1973#257241374
02/28/1974Inactive241476
04/30/1974Inactive238776
06/30/1974#260241275
08/31/1974#260241475
10/31/1974Inactive240780
12/31/1974Inactive242380
02/28/1975#232243068
04/30/1975#264241168
06/30/1975#248242468
08/31/1975#246242668
10/31/1975#248242569
12/31/1975#250242469
02/29/1976#270240572
04/30/1976#305238972
06/30/1976#285240372
08/31/1976#285240772
10/31/1976#295240773
12/31/1976#312240873
02/28/1977Inactive240378
04/30/1977Inactive239078
06/30/1977Inactive239978
08/31/1977Inactive240378
10/31/1977Inactive239979
12/31/1977Inactive239779
02/28/1978Inactive239783
04/30/1978Inactive237883
06/30/1978Inactive238983
08/31/1978Inactive239383
10/31/1978Inactive238983
12/31/1978Inactive238783
10/31/1979Inactive236681
12/31/1979Inactive236781
01/31/1980Inactive236881
02/29/1980Inactive237484
03/31/1980Inactive237484
04/30/1980Inactive236284
05/31/1980Inactive236284
06/30/1980#389239971
07/31/1980#394240071
08/31/1980#438237869
09/30/1980#441237869
10/31/1980#438237871
11/30/1980#442237871
12/31/1980#448237371
01/31/1981#542233668
02/28/1981#522233368
03/31/1981#532233268
04/30/1981#549232168
05/31/1981#546232068
06/30/1981Inactive239181
07/31/1981Inactive239181
08/31/1981Inactive237079
09/30/1981Inactive236979
10/31/1981Inactive237181
11/30/1981Inactive237281
12/31/1981Inactive237081
01/31/1982Inactive233077
02/28/1982Inactive233178
03/31/1982Inactive233078
04/30/1982Inactive232178
05/31/1982Inactive232078
08/31/1982Inactive237583
09/30/1982Inactive237283
01/31/1983Inactive233488
02/28/1983Inactive233789
03/31/1983Inactive233689
04/30/1983Inactive232989
05/31/1983Inactive232789

These ratings, calculated for Schiffer, Karl Josef, 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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