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Career ratings for: Lewi, Jerzy

  Date of rating  

World Rank Rating +/- Age
03/31/1966#399224565
06/30/1966#409222667
09/30/1966#426222567
12/31/1966#433223366
03/31/1967#451223774
06/30/1967Inactive222077
09/30/1967Inactive221677
12/31/1967#447222672
03/31/1968#377229361
06/30/1968#356232060
09/30/1968#364231460
12/31/1968#367231760
03/31/1969#304236753
06/30/1969#300237153
09/30/1969#303236753
12/31/1969#304237053
02/28/1970#321236953
04/30/1970#278238356
06/30/1970#278238356
08/31/1970#277238456
10/31/1970#283238356
12/31/1970#278238656
02/28/1971#322236357
04/30/1971#288237462
06/30/1971#291237662
08/31/1971#303237762
10/31/1971#301237662
12/31/1971#289237861
02/29/1972#335237264
04/30/1972#307238370
06/30/1972#305238570
08/31/1972#305238770
10/31/1972#315238270
12/31/1972#303238669
02/28/1973#339237372
04/30/1973Inactive238280
06/30/1973Inactive238680
08/31/1973Inactive238780
10/31/1973Inactive238580
12/31/1973Inactive238879
02/28/1974Inactive237482

These ratings, calculated for Lewi, Jerzy, 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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