Back to names list

Career ratings for: Letzelter, Jean Claude

  Date of rating  

World Rank Rating +/- Age
06/30/1968#489220663
09/30/1968#501220063
12/31/1968#502221061
03/31/1969#506221861
06/30/1969#512221366
09/30/1969#520220966
12/31/1969#495221168
02/28/1970#567220968
04/30/1970#486221669
06/30/1970Inactive220876
08/31/1970Inactive220976
10/31/1970Inactive220876
12/31/1970Inactive220878
02/28/1971Inactive220378
04/30/1971Inactive221078
06/30/1971Inactive220486
08/31/1971Inactive220586
10/31/1971Inactive220386
12/31/1971Inactive220189
02/29/1972Inactive220589
04/30/1972Inactive221289
10/31/1972Inactive223182
12/31/1972Inactive223283
02/28/1973Inactive223183
04/30/1973Inactive223683
06/30/1973Inactive223785
08/31/1973Inactive223885
02/28/1975Inactive220879
04/30/1975Inactive221279
06/30/1975Inactive221080
08/31/1975Inactive221180
10/31/1975Inactive220181
12/31/1975Inactive220481
12/31/1976Inactive220585

These ratings, calculated for Letzelter, Jean Claude, 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.

Back to top

Home