Since both rating formula and ratings themselves changed, it’s interesting to see how ranks changed. I polled a bunch of active players. So linear.
Roughly like this, from linear fit
new_rank = 0.75459341 * old_rank + 9.00910366
So at 30k we get 9 stone boost to 21k. And at 7d we get no change at all. And at stronger 9d ranks it means their ranks get a little more difficult.
The ranks get a little bunched up, so with the same strength difference you’d give less handicap stones with the new system.