E Michael White wrote:The effect Mike Gunn mentions will speed up the overall deflation and spread of grades throughout
Mike Gunn wrote:Consider a player who plays 40 games a year. Because of the count-back method the 10 games he plays immediately before the end of the cut off period will be counted twice in calculating his grade (i.e. in January and July) whereas the other 10 games will be used just once.
Paul Cooksey wrote:I have not seen anything explaining the aims of the grading changes. I hope it will published.
Paul Cooksey wrote:However I have not seen an explanation for the way it has been implemented. I question counting back exactly 30 games, how the junior grade calculation is done, and using unpublished grades in January and July. (Mainly the former because I think it creates unnecessary volatility, and the latter two because I think I ought to know the grade of a person I am playing)
Quite possible that these things were necessary, but it would be nice to know why.
Christopher Kreuzer wrote:I think it would be more logical to go back in blocks of entire grading lists until you get above 30 games. So for your hypothetical example, you would end up with using 40 games in the July list instead of 30 games.
Richard Bates wrote:Once you have excluded the principle of operating a 'rolling list' (thereby maintaining the linkage of the grading calculation to a calendar season) then if you want to avoid the issue of games at the end of a period being potentially more important than games at the beginning of a period then the logical solution is to apply a weighting in line with the number of games needed to make it up to 30. So in the above example you would use the 29 games at a performance of 160 and 1 game at a performance of 140 (the average from the previous period).
Richard Bates wrote:...suppose a player plays 30 games between July and December, performing at 140. They then play 29 games between January and, say, May, performing at 160. If they play no more games before the grading cut off then their grade will be 150 (and a little bit). But if they can just play one more game, against any opposition and with any result, their new grade will be substantially higher, because they will have reached the magic number of 30 and they can forget about the games played in the earlier period.
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