Short answer is “make run” slightly longer answer is as follows:
I use the new OGS rating to rank conversion formula (ln(rating/525)*23.15 iirc) to get the participants’ strengths in terms of stones, and then multiply by 14 and round off to the nearest integer (I suspect there is currently a bug causing it to round not to the nearest integer, but to either even or odd, but I’m looking into that today; should be a simple fix) to get the participants’ strengths in terms of points.
Then, when two players are matched, I add 7 (for komi) to the result of the above paragraph for Black, and subtract the result of the above paragraph for White.
This is equivalent to doing 7 - strength gap when White is stronger, and 7 + strength gap when Black is stronger.