I would imagine that "practical significance" depends on the absolute
level. Between two beginners 23% means little as it can be overtaken
by a day's study. Between top-professionals it probably means the
difference between a legendary 9p winning many top-title tournaments
and a 9p who never wins a top title in his life.
Good point about the stability of rank. But is a 62:38 ratio enough to
claim that kind of difference? If they play 20 title matches a year,
over a 20 year career, isn't that enough for them to get the winning
streak required to win some titles?
That's not too far from the winrates between Cho Hunhyun and Seo
Bongsoo.
The latter is far from the glory of the former, but when they were by
far the two strongest players in Korea, Seo has won his share of titles.
Jonas
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