Win rate by players ranks in OGS

[BHydden]

@gennan

For completeness, maybe you should include how OGS computes ranks from Elo ratings?

Here you go.

@anoek

The ratings to ranking math is not as pretty as it is under the EGF model, it’s 850*exp(rank*0.032) where 30k is rank 0. For instance, 9k is 1664.4 and 10k is 1612.0.