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Career ratings for: Piasetski, Leon David

  Date of rating  

World Rank Rating +/- Age
02/29/1972Inactive230581
04/30/1972Inactive230277
06/30/1972Inactive230477
08/31/1972Inactive230277
10/31/1972Inactive229877
12/31/1972Inactive231081
02/28/1973Inactive235976
04/30/1973#364236275
06/30/1973#362236675
08/31/1973#365236575
10/31/1973#370235975
12/31/1973Inactive236276
02/28/1974Inactive235287
04/30/1974Inactive235485
06/30/1974#290239774
08/31/1974#289239774
10/31/1974#295239174
12/31/1974#284239574
02/28/1975#233243069
04/30/1975#239242868
06/30/1975#222243569
08/31/1975#224243569
10/31/1975#235243269
12/31/1975#219244069
02/29/1976Inactive242678
04/30/1976Inactive242678
06/30/1976Inactive243479
08/31/1976Inactive243679
10/31/1976Inactive243579
12/31/1976#225245273
02/28/1977Inactive244078
04/30/1977Inactive244178
06/30/1977Inactive244579
08/31/1977Inactive244779
10/31/1977Inactive244379
12/31/1977#165249363
02/28/1978#178248463
04/30/1978#179248163
06/30/1978#158249763
08/31/1978#153250561
10/31/1978#137251359
12/31/1978#124252462
02/28/1979#137251762
04/30/1979#144251562
06/30/1979#139251562
08/31/1979#158249962
10/31/1979#142251066
12/31/1979#124252570
01/31/1980#130252770
02/29/1980#131252170
03/31/1980#131252170
04/30/1980#137252070
05/31/1980#137252170
06/30/1980#130252570
07/31/1980#131252670
08/31/1980#154250971
09/30/1980#156250971
10/31/1980#137252075
11/30/1980#134252075
12/31/1980Inactive252880
01/31/1981#221247269
02/28/1981#220246569
03/31/1981#225246469
04/30/1981#225246269
05/31/1981#223246169
06/30/1981#224246369
07/31/1981#229246369
08/31/1981#261245070
09/30/1981#260244970
10/31/1981#268245171
11/30/1981#260245471
12/31/1981#250245673
01/31/1982Inactive246779
02/28/1982Inactive246379
03/31/1982Inactive246379
04/30/1982Inactive246279
05/31/1982Inactive246079
06/30/1982Inactive246279
07/31/1982Inactive246079
08/31/1982Inactive245180
09/30/1982Inactive244880
10/31/1982Inactive245381
11/30/1982Inactive245481
12/31/1982Inactive245984
04/30/1984#421241569
05/31/1984#427241569
06/30/1984#429241969
07/31/1984#436241969
08/31/1984#460241469
09/30/1984#445241867
10/31/1984#440241968
11/30/1984#449241968
12/31/1984#445242068
01/31/1985#438242671
02/28/1985#444242371
03/31/1985#454242071
04/30/1985Inactive241779
05/31/1985Inactive241679
06/30/1985Inactive241979
07/31/1985Inactive242179
08/31/1985Inactive241479
09/30/1985Inactive241977
10/31/1985Inactive241977
11/30/1985Inactive242377
12/31/1985Inactive242277
01/31/1986Inactive242881
02/28/1986Inactive242181
03/31/1986Inactive242181
09/30/1986Inactive242088
10/31/1986Inactive241888
11/30/1986Inactive242088
12/31/1986Inactive242288
01/31/1988#350246371
02/29/1988#368246271
03/31/1988#364246271
04/30/1988#341247072
05/31/1988#344246972
06/30/1988#338247272
07/31/1988#336247372
08/31/1988#355246972
09/30/1988#354247071
10/31/1988#354246871
11/30/1988#397245767
12/31/1988#408246067
01/31/1989#427245767
02/28/1989#431245567
03/31/1989#435245667
04/30/1989#415246067
05/31/1989#418246067
06/30/1989#411246167
07/31/1989#404246267
08/31/1989#427245967
09/30/1989#432246167
10/31/1989#427245967
11/30/1989#435245969
12/31/1989#438246269
01/31/1990Inactive245976
02/28/1990Inactive245676
03/31/1990Inactive245676
04/30/1990#439246364
05/31/1990#432245964
06/30/1990#623242258
07/31/1990#615242358
08/31/1990#644242158
09/30/1990#654242158
10/31/1990#656242058
11/30/1990#668241658
12/31/1990#663241858
01/31/1991#720241058
02/28/1991#828239559
03/31/1991#844239459
04/30/1991#705241860
05/31/1991#697242060
06/30/1991#678242564
07/31/1991#668242664
08/31/1991#705242464
09/30/1991#705242364
10/31/1991#699242264
11/30/1991#720242065
12/31/1991#709242165
01/31/1992#868239963
02/29/1992#987238564
03/31/1992#981238564
04/30/1992#850240165
05/31/1992#840240265
06/30/1992#895239468
07/31/1992#893239668
08/31/1992#926239468
09/30/1992#931239568
10/31/1992#919239768
11/30/1992#939239368
12/31/1992#937239768
01/31/1993#1076237967
02/28/1993#1190236667
03/31/1993#1280235766
04/30/1993#1127237467
05/31/1993#1131237367
06/30/1993#1019238674
07/31/1993#1025238674
08/31/1993#1062238274
09/30/1993#1162237272
10/31/1993#1157237372
11/30/1993#1172237172
12/31/1993#1165237472
01/31/1994#1624233163
02/28/1994#1769232064
03/31/1994#1753232064
04/30/1994#1618233264
05/31/1994#1618233564
06/30/1994#1573233866
07/31/1994#1562233966
08/31/1994#1617233566
09/30/1994#1602233667
10/31/1994#1586233567
11/30/1994#1639233567
12/31/1994#1625233667
01/31/1995#1730232972
02/28/1995#1858231870
03/31/1995#1833232071
04/30/1995#1686233271
05/31/1995#1693233271
06/30/1995#1611234071
07/31/1995#1612234071
08/31/1995#1669233871
09/30/1995#1652234071
10/31/1995#1632234371
11/30/1995#1658234071
12/31/1995#1640234471
01/31/1996Inactive233682
02/29/1996Inactive232680
03/31/1996Inactive232881
04/30/1996Inactive233981
05/31/1996Inactive233981
06/30/1996Inactive234381
07/31/1996Inactive234381
08/31/1996Inactive233981
09/30/1996Inactive233981
10/31/1996Inactive234181
11/30/1996Inactive233982
12/31/1996Inactive234282

These ratings, calculated for Piasetski, Leon David, 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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