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Career ratings for: Costa, Jean Luc

  Date of rating  

World Rank Rating +/- Age
07/31/1986#703234469
08/31/1986#740233067
09/30/1986#732233267
10/31/1986#703234867
11/30/1986#748233766
12/31/1986#749233966
01/31/1987#841230564
02/28/1987#860229459
03/31/1987#874229259
04/30/1987#906228859
05/31/1987#904228859
06/30/1987#915229059
07/31/1987#749234762
08/31/1987#788233561
09/30/1987#792233661
10/31/1987#758234861
11/30/1987#791233861
12/31/1987#788233961
01/31/1988#934231361
02/29/1988#1029228665
03/31/1988#1056228465
04/30/1988#1053228465
05/31/1988#1058228365
06/30/1988#1046229364
07/31/1988#744236860
08/31/1988#782236460
09/30/1988#778236560
10/31/1988#729237460
11/30/1988#809236460
12/31/1988#819236960
01/31/1989#981234361
02/28/1989#1083232262
03/31/1989#1164230760
04/30/1989#1169230760
05/31/1989#1155231259
06/30/1989#1154231659
07/31/1989#881236661
08/31/1989#987235062
09/30/1989#815238259
10/31/1989#774238959
11/30/1989#835238159
12/31/1989#820238759
01/31/1990#993236560
02/28/1990#1146233760
03/31/1990#1091234762
04/30/1990#1093234862
05/31/1990#922236957
06/30/1990#908237657
07/31/1990#804239255
08/31/1990#859238755
09/30/1990#870238755
10/31/1990#821239555
11/30/1990#921237855
12/31/1990#918238055
01/31/1991#904238254
02/28/1991#1014236753
03/31/1991#988237253
04/30/1991#1022236953
05/31/1991#1034237052
06/30/1991#1034237252
07/31/1991#836239953
08/31/1991#874239653
09/30/1991#983238154
10/31/1991#871239653
11/30/1991#926238853
12/31/1991#984238153
01/31/1992#701242452
02/29/1992#687242653
03/31/1992#660242953
04/30/1992#705242253
05/31/1992#720242154
06/30/1992#667242953
07/31/1992#551245154
08/31/1992#567244954
09/30/1992#631244154
10/31/1992#601244755
11/30/1992#772241454
12/31/1992#821241254
01/31/1993#979239052
02/28/1993#987239153
03/31/1993#960239353
04/30/1993#973239253
05/31/1993#996238953
06/30/1993#1031238454
07/31/1993#930239954
08/31/1993#946239754
09/30/1993#996239054
10/31/1993#1022238654
11/30/1993#1045238554
12/31/1993#1083238254
01/31/1994#1082238555
02/28/1994#1156237955
03/31/1994#1057238655
04/30/1994#1074238555
05/31/1994#1092238655
06/30/1994#1129238056
07/31/1994#1059238956
08/31/1994#1100238656
09/30/1994#1152238056
10/31/1994#1072238657
11/30/1994#1101238757
12/31/1994#1139238257
01/31/1995#1086238856
02/28/1995#1070238955
03/31/1995#1009239455
04/30/1995#1028239454
05/31/1995#1039239355
06/30/1995#1077239255
07/31/1995#1006239955
08/31/1995#1027239955
09/30/1995#1057239655
10/31/1995#1000240455
11/30/1995#1010240255
12/31/1995#1053240055
01/31/1996#1261238455
02/29/1996#1227238756
03/31/1996#1148239156
04/30/1996#1160239056
05/31/1996#1179238856
06/30/1996#1209238457
07/31/1996#1127239057
08/31/1996#1152239057
09/30/1996#1199238557
10/31/1996#1138239257
11/30/1996#1136239157
12/31/1996#1160239057
01/31/1997#1293237758
02/28/1997#1261238060
03/31/1997#1217238460
04/30/1997#1229238460
05/31/1997#1223238160
06/30/1997#1252237960
07/31/1997#1195238560
08/31/1997#1197238460
09/30/1997#1226237960
10/31/1997#1159238560
11/30/1997#1181238360
12/31/1997#1195238160
01/31/1998#1268237365
02/28/1998#1428236166
03/31/1998#1380236766
04/30/1998#1396236766
05/31/1998#1400236666
06/30/1998#1436236366
07/31/1998#1365236966
08/31/1998#1373236766
09/30/1998#1422236266
10/31/1998#1358236566
11/30/1998#1373236266
12/31/1998#1386236166
01/11/1999#1278236166
01/18/1999#1279236166
01/25/1999#1279236266
02/01/1999#1368235072
02/08/1999#1372235172
02/15/1999#1381235072
02/22/1999#1388235172
03/01/1999#1313235675
03/08/1999#1317235875
03/15/1999#1316235775
03/22/1999#1312235975
03/29/1999#1315235975
04/05/1999#1280236575
04/12/1999#1281236575
04/19/1999#1285236575
04/26/1999#1291236575
05/03/1999#1294236574
05/10/1999#1294236474
05/17/1999#1294236474
05/24/1999#1303236274
05/31/1999#1308236274
06/07/1999#1312236075
06/14/1999#1311236075
06/21/1999#1315236075
06/28/1999#1318236175
07/05/1999#1343236075
07/12/1999#1343236075
07/19/1999#1341236175
07/26/1999#1342236275
08/02/1999#1265236875
08/09/1999#1268236975
08/16/1999#1269236675
08/23/1999#1273236875
08/30/1999#1276236775
09/06/1999#1272236675
09/13/1999#1269236675
09/20/1999#1276236675
09/27/1999#1276236675
10/04/1999#1314236375
10/11/1999#1317236375
10/18/1999#1326236475
10/25/1999#1325236475
11/01/1999#1287236875
11/08/1999#1288236875
11/15/1999#1294236875
11/22/1999#1298236875
11/29/1999#1300236975
12/06/1999Inactive236675
12/13/1999Inactive236775
12/20/1999Inactive236675
12/27/1999Inactive236675
01/03/2000Inactive236675
01/10/2000Inactive236775
01/17/2000Inactive236875
01/24/2000Inactive236875
01/31/2000Inactive236975
02/07/2000Inactive235982
02/14/2000Inactive235882
02/21/2000Inactive235982
02/28/2000Inactive236082
03/06/2000Inactive236785
03/13/2000Inactive236685
03/20/2000Inactive236685
03/27/2000Inactive236585
04/03/2000Inactive236385
04/10/2000Inactive236785
04/17/2000Inactive236785
04/24/2000Inactive236685
05/01/2000Inactive236685
05/08/2000Inactive236485
05/15/2000Inactive236685
05/22/2000Inactive236585
05/29/2000Inactive236585
06/05/2000Inactive236485
06/12/2000Inactive236385
06/19/2000Inactive236485
06/26/2000Inactive236385
07/03/2000Inactive236485
07/10/2000Inactive236286
07/17/2000Inactive236286
07/24/2000Inactive236286
07/31/2000Inactive236286
08/07/2000Inactive236785
08/14/2000Inactive236885
08/21/2000Inactive236885
08/28/2000Inactive236885
09/04/2000Inactive236885
09/11/2000Inactive236885
09/18/2000Inactive236885
09/25/2000Inactive236985
10/02/2000Inactive236785
10/09/2000Inactive236486
10/16/2000Inactive236286
10/23/2000Inactive236286
10/30/2000Inactive236186
11/06/2000Inactive236786
11/13/2000Inactive236786
11/20/2000Inactive236986
11/27/2000Inactive236986
12/04/2000Inactive237186
12/11/2000Inactive237086
12/18/2000Inactive237286
12/25/2000Inactive237386
01/01/2001Inactive237386
01/08/2001Inactive237286
01/15/2001Inactive237286
01/22/2001Inactive237286
01/29/2001Inactive237386
02/05/2001Inactive237386

These ratings, calculated for Costa, Jean Luc, 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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