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Post being replied to

Ah, point # 1 is brilliant (if minor). Never thought of it. by BabaGhanouj

I think I understand point #2. Am I right in stating the proposition as perhaps, as players are rated farther from the top, the differentiation is more difficult and thus the ratings may be less accurate? Sounds reasonable. I agree it could be developed by more testing.

Point #3, I agree would be an interesting exercise. I would guess injury would be a big factor along with ones you mention. But that is untested.