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Career ratings for: McDonald Ross, Michael

  Date of rating  

World Rank Rating +/- Age
08/31/1970#453225474
10/31/1970#468225875
12/31/1970#466225775
02/28/1971#479225175
04/30/1971#434225375
06/30/1971#440225675
08/31/1971#440226973
10/31/1971#424227274
12/31/1971#422226874
02/29/1972#493227074
04/30/1972#469227274
06/30/1972#461227674
08/31/1972Inactive227184
10/31/1972Inactive227184
12/31/1972Inactive226884
02/28/1973Inactive226579
04/30/1973Inactive226679
06/30/1973Inactive227179
08/31/1973Inactive226686
10/31/1973Inactive226787
12/31/1973Inactive226387
12/31/1974Inactive224688
08/31/1975Inactive223185
10/31/1975Inactive223185
12/31/1975Inactive227182
02/29/1976Inactive227879
04/30/1976Inactive224683
06/30/1976Inactive228279
08/31/1976#513226070
10/31/1976#517226270
12/31/1976#508229370
02/28/1977#477229969
04/30/1977#525227470
06/30/1977#486230169
08/31/1977Inactive226280
10/31/1977Inactive226180
12/31/1977Inactive228979
02/28/1978Inactive229479
04/30/1978Inactive225976
06/30/1978Inactive228675
08/31/1978Inactive224984
10/31/1978Inactive224784
12/31/1978Inactive227484
02/28/1979Inactive227983
04/30/1979Inactive225587
06/30/1979Inactive228086
10/31/1979#611224972
12/31/1979#607224466
01/31/1980#679224566
02/29/1980#617224966
03/31/1980#634224966
04/30/1980#649222265
05/31/1980#663222265
06/30/1980#638224265
07/31/1980#647224365
08/31/1980#662221265
09/30/1980#665221265
10/31/1980#662222369
11/30/1980#673222469
12/31/1980#651224675
01/31/1981#703224675
02/28/1981#663224675
03/31/1981#674224575
04/30/1981#708221674
05/31/1981#701221574
06/30/1981#696223474
07/31/1981#716223474
08/31/1981#747220474
09/30/1981#747220374
10/31/1981Inactive221778
11/30/1981Inactive221878
12/31/1981Inactive224485
01/31/1982Inactive224185
02/28/1982Inactive224485
03/31/1982Inactive224385
04/30/1982Inactive221684
05/31/1982Inactive221484
06/30/1982Inactive223384
07/31/1982Inactive223184
08/31/1982Inactive220080
09/30/1982Inactive219780
10/31/1982Inactive221283
11/30/1982Inactive221283
12/31/1982Inactive223887
01/31/1983Inactive223587
02/28/1983Inactive224187
03/31/1983Inactive224087
04/30/1983Inactive221687
05/31/1983Inactive221587
06/30/1983Inactive223387
07/31/1983Inactive223287

These ratings, calculated for McDonald Ross, Michael, 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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