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Career ratings for: Botterill, George Steven

  Date of rating  

World Rank Rating +/- Age
12/31/1969Inactive215383
02/28/1970Inactive215183
08/31/1970Inactive226078
10/31/1970Inactive226078
12/31/1970#510222472
02/28/1971#449227468
04/30/1971#402228669
06/30/1971#406228869
08/31/1971#386231672
10/31/1971#316236667
12/31/1971#260239257
02/29/1972#289239657
04/30/1972#239242158
06/30/1972#257241458
08/31/1972#205243858
10/31/1972#220243158
12/31/1972#300238662
02/28/1973#237242960
04/30/1973#192245160
06/30/1973#206244660
08/31/1973#171246559
10/31/1973#170246259
12/31/1973#232242760
02/28/1974#251241662
04/30/1974#212243563
06/30/1974#225242862
08/31/1974#170245963
10/31/1974#177245263
12/31/1974#189244756
02/28/1975#239242955
04/30/1975#232243253
06/30/1975#239242953
08/31/1975#190245154
10/31/1975#196244954
12/31/1975#275241256
02/29/1976#286239856
04/30/1976#240242958
06/30/1976#251242658
08/31/1976#229244158
10/31/1976#240244058
12/31/1976#321239860
02/28/1977#326240160
04/30/1977#227245458
06/30/1977#231244958
08/31/1977#192247557
10/31/1977#194247257
12/31/1977#321241155
02/28/1978#317241055
04/30/1978#298241856
06/30/1978#314241656
08/31/1978#351240855
10/31/1978#352240655
12/31/1978#419237955
02/28/1979#416237954
04/30/1979#416238455
06/30/1979#410238155
08/31/1979#303242654
10/31/1979#324241954
12/31/1979#331241856
01/31/1980#347242056
02/29/1980#299243157
03/31/1980#303243157
04/30/1980#316242656
05/31/1980#320242656
06/30/1980#296243756
07/31/1980#299243856
08/31/1980#295243760
09/30/1980#298243760
10/31/1980#317242859
11/30/1980#317242859
12/31/1980#337242162
01/31/1981#366241462
02/28/1981#329242162
03/31/1981#333242062
04/30/1981#348241462
05/31/1981#344241362
06/30/1981#334242462
07/31/1981#340242362
08/31/1981#334242366
09/30/1981#335242266
10/31/1981#363241566
11/30/1981#364241666
12/31/1981#370241169
01/31/1982#377240970
02/28/1982#344241970
03/31/1982#345241870
04/30/1982#372241470
05/31/1982#370241270
06/30/1982#347242370
07/31/1982#351242070
08/31/1982#346242475
09/30/1982#344242175
10/31/1982#380241774
11/30/1982#379241774
12/31/1982Inactive241479
01/31/1983Inactive241380
02/28/1983Inactive242580
03/31/1983Inactive242480
04/30/1983Inactive242179
05/31/1983Inactive242079
06/30/1983Inactive243080
07/31/1983Inactive242980
08/31/1983#296245171
09/30/1983#307245471
10/31/1983#321244571
11/30/1983#326244771
12/31/1983#329244473
01/31/1984#325244373
02/29/1984#299245173
03/31/1984#298245373
04/30/1984#325245073
05/31/1984#326245173
06/30/1984#297246173
07/31/1984#300246173
08/31/1984#317246070
09/30/1984#316246070
10/31/1984#334245570
11/30/1984#338245570
12/31/1984#300246863
01/31/1985#295246863
02/28/1985#282247463
03/31/1985#282247363
04/30/1985#330245362
05/31/1985#333245362
06/30/1985#319245963
07/31/1985#318246263
08/31/1985#337245867
09/30/1985#336245867
10/31/1985#353245667
11/30/1985#352245867
12/31/1985#302246972
01/31/1986#306247172
02/28/1986#293247372
03/31/1986#296247572
04/30/1986#345245571
05/31/1986#340245671
06/30/1986#325246071
07/31/1986#437243066
08/31/1986#452242369
09/30/1986#452242369
10/31/1986#452241869
11/30/1986#455242069
12/31/1986#440242672
01/31/1987#445242772
02/28/1987#558239363
03/31/1987#555239663
04/30/1987#595238163
05/31/1987#597238163
06/30/1987#600238663
07/31/1987#571239164
08/31/1987#665236363
09/30/1987#675236363
10/31/1987#703236063
11/30/1987#692236163
12/31/1987#682236363
01/31/1988#712236962
02/29/1988#691237565
03/31/1988#688237865
04/30/1988#732236965
05/31/1988#733236865
06/30/1988#712237265
07/31/1988#698237966
08/31/1988#757236971
09/30/1988#761236971
10/31/1988#781236571
11/30/1988#795236771
12/31/1988#813237171
01/31/1989#802237470
02/28/1989#779237874
03/31/1989#763238274
04/30/1989#828237174
05/31/1989#841237174
06/30/1989#827237474
07/31/1989Inactive237975
08/31/1989Inactive237181
09/30/1989Inactive237281
10/31/1989Inactive236881
11/30/1989Inactive237081
12/31/1989Inactive237582
01/31/1990Inactive237780
02/28/1990Inactive238085
03/31/1990Inactive238285
04/30/1990Inactive237385
05/31/1990Inactive237085
06/30/1990Inactive237685
07/31/1990Inactive238186

These ratings, calculated for Botterill, George Steven, 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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