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Career ratings for: Van Voorthuijsen, PW.

  Date of rating  

World Rank Rating +/- Age
01/31/1983#410240575
02/28/1983#412240375
03/31/1983#419240375
04/30/1983#410240575
05/31/1983#412240575
06/30/1983#416240575
07/31/1983#400241375
08/31/1983#408241275
09/30/1983#429241575
10/31/1983#430241375
11/30/1983#437241475
12/31/1983#425241375
01/31/1984Inactive240186
02/29/1984Inactive239786
03/31/1984Inactive239886
04/30/1984Inactive240086
05/31/1984Inactive240186
06/30/1984Inactive240186
07/31/1984#462240968
08/31/1984#472240968
09/30/1984#469240968
10/31/1984#463241268
11/30/1984#473241168
12/31/1984#469241268
01/31/1985#555238970
02/28/1985#554238870
03/31/1985#553238770
04/30/1985#552238470
05/31/1985#549238470
06/30/1985#555238470
07/31/1985Inactive240378
08/31/1985Inactive240378
09/30/1985Inactive240378
10/31/1985Inactive240678
11/30/1985Inactive240878
12/31/1985Inactive240778
01/31/1986Inactive238480
02/28/1986Inactive238080
03/31/1986Inactive238280
04/30/1986Inactive237980
05/31/1986Inactive237980
06/30/1986Inactive237880
07/31/1986Inactive239989
08/31/1986Inactive239789
09/30/1986Inactive239789
10/31/1986Inactive239889
11/30/1986Inactive239989
12/31/1986Inactive240189
01/31/1995#2690225175
02/28/1995#2689225075
03/31/1995#2711225075
04/30/1995#2739224875
05/31/1995#2749224975
06/30/1995#2661225775
07/31/1995#2642225975
08/31/1995#2667226075
09/30/1995#2731225875
10/31/1995#2691226475
11/30/1995#2686226375
12/31/1995#2676226775
01/31/1996Inactive225086
02/29/1996Inactive225086
03/31/1996Inactive225086
04/30/1996Inactive224786
05/31/1996Inactive224786
06/30/1996Inactive225386
07/31/1996Inactive225586
08/31/1996Inactive225586
09/30/1996Inactive225286
10/31/1996Inactive225686
11/30/1996Inactive225586
12/31/1996Inactive226086
01/31/1997#2337229770
02/28/1997#2342229870
03/31/1997#2357229870
04/30/1997#2393229670
05/31/1997#2381229470
06/30/1997#2337229870
07/31/1997#2330229970
08/31/1997#2336229970
09/30/1997#2375229570
10/31/1997#2293230070
11/30/1997#2259229970
12/31/1997#2247230070
01/31/1998Inactive228780
02/28/1998Inactive228880
03/31/1998Inactive229080
04/30/1998Inactive228980
05/31/1998Inactive228980
06/30/1998Inactive229280
07/31/1998Inactive229380
08/31/1998Inactive229180
09/30/1998Inactive228780
10/31/1998Inactive229180
11/30/1998Inactive229080
12/31/1998Inactive229180
01/11/1999Inactive229180
01/18/1999Inactive229280
01/25/1999Inactive229280

These ratings, calculated for Van Voorthuijsen, PW., 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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