Stockport and District Chess League 

 

Players' Current Performance for 2018-2019 Season

 

Jump to Explanation of Grade Calculations

 

The table lists all players in descending order of current average grade (that is performance to date) who have played a minimum of 3 games.
In the table a player's performances allows for notional grades of ungraded opponents.


The % column is shown for players who have played 6 or more games. The player with the highest percentage (points per game) over the season is awarded the Vic Knox Trophy. Click here to view the data ordered by percentage.

  Select players by club  

Explanation of grading calculations  

The "current average grade" (current performance) quoted on the Stockport League website is an unofficial one calculated on current Stockport League results only, purely for players' interest. It has no ECF legality and should not be quoted outside the League. The legal grading for each player is calculated by the ECF twice yearly; at the end of January, and at the end of July. The calculation on this site is based on last July's grades; the January revision is not taken into account.

The Grading Officer does not use the website grade in his submissions to the ECF, which are completely independent of the website. His submissions are incorporated by the ECF into any other results that each of the Stockport League players has produced in other leagues, tournaments, etc.

Here is an explanation of the Stockport League website grades:
To do the calculations for the current average grade I need to have a grade from last season for every player. In the following I call this the 'lsgrade'. For most players in the League I have an official ECF grade and, for these players, this is the lsgrade. However, a number of players in the Stockport League do not have ECF grades from last season. In order to give such players and their opponents an idea of how well they are playing I have to assign a notional (entirely unofficial) lsgrade to each one of these ungraded players. At the end of the season I adjust the lsgrades of such players who have played 3 or more games to reflect their performance during the season.

The grading calculation is as for the ECF grade calculation:
For every win I score the player's opponent's lsgrade plus 50; for every draw I score the player's opponent's lsgrade; for every loss I score the player's opponent's lsgrade minus 50.
The current grade is the average of such scores to date.

It is possible with this simple system to lose grading points even if you win a game because you are playing a much weaker opponent than yourself. Similarly, it is possible to gain grading points even if you lose a game because you are playing a much stronger opponent than yourself. For this reason the ECF system is modified and the Stockport League calculations also incorporate this modification (except where the player has an estimated grade).
If an opponent's lsgrade is more than 40 grading points below the player's lsgrade then it is assumed for grading purposes that his lsgrade is the player's grade less 40.
If an opponent's lsgrade is more than 40 grading points above the player's lsgrade then it is assumed for grading purposes that his lsgrade is the player's lsgrade plus 40.
This also has the effect of mitigating against 'freak' results, such as where a player has an unrealistic grade.

If you still don't understand the grading system try out the ECF website !

 

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