This is quite at odds with my experience trying to help Isaac achieve to his potential. Ratings extremely rarely move by 100pts in a few months, and the children who might have some chance to excel are those who have been playing strong tournaments for many years by the age of 12.Richard Bates wrote: I think that putting together "world comparisons" at such a young age is not particularly useful - there are too many variables (you will get players who have been playing for 6 years and others for 2, players who have played dozens of international tournaments and others with a handful, players who have been intensively coached (not always to their long run benefit) and others who are largely self-taught) and anyway 100pts at that age is a mere drop in the ocean when it is normal for ratings to go up by that amount in a few months.
The world comparisons are done for us by FIDE ratings, which seem to be reasonably accurate, again in my experience, allowing for a bit of a lag (less these days) due to the delay in adding new results to the database. Rates of improvement seem to be fairly predictable too - with a few degrees difference in the incline here or there, and the odd set back. Perhaps inexperience causes children to under-perform in big international tournaments but that is easily fixed
The most critical years I would suggest are ages 10 - 12 for the simple fact that if you don't get over the first big hurdle by the age of 14 GCSEs start looming. And indeed if you impose ENG registered improvement graphs on the best of their age groups you find that the ENGs are between 1 and 3 years behind their peers in the top 200 for each birth year.
By way of illustration, Isaac (age 12 and FIDE U14) is roughly 80th in the world for his birth year, 240th at U14, but 1st at U14 in England. We have had to bow out of ECF junior selection in order to give him as much chance as possible of catching up.