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Career ratings for: Welsh, Michael

  Date of rating  

World Rank Rating +/- Age
01/31/1995#2485226772
02/28/1995#2483226872
03/31/1995#2555226372
04/30/1995#2541226572
05/31/1995#2286228573
06/30/1995#2245228973
07/31/1995#2263228773
08/31/1995#2324228673
09/30/1995#2396228373
10/31/1995#2401228573
11/30/1995#2397228473
12/31/1995#2403228573
01/31/1996#2832226166
02/29/1996#2835226366
03/31/1996#2895225966
04/30/1996#2861226066
05/31/1996#2645227566
06/30/1996#2595227666
07/31/1996#2624227566
08/31/1996#2554228265
09/30/1996#2590227865
10/31/1996#2760227064
11/30/1996#2774226964
12/31/1996#2792226964
01/31/1997#2988225370
02/28/1997#2977225470
03/31/1997#3045225270
04/30/1997#3032225370
05/31/1997#2690227573
06/30/1997#2649227873
07/31/1997#2674227773
08/31/1997#2708227474
09/30/1997#2854226372
10/31/1997#3007225671
11/30/1997#3019225371
12/31/1997#3051225371
01/31/1998Inactive224380
02/28/1998Inactive224480
03/31/1998Inactive224480
04/30/1998Inactive224780
05/31/1998Inactive227083
06/30/1998Inactive227283
07/31/1998Inactive227183
08/31/1998Inactive226784
09/30/1998Inactive225682
10/31/1998Inactive224781
11/30/1998Inactive224481
12/31/1998Inactive224481
01/11/1999Inactive224481
01/18/1999Inactive224481
01/25/1999Inactive224481

These ratings, calculated for Welsh, Michael, 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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