cryptoguru: Personally I would like that. But then you and I are mathematicians. Most people I suspect will be happy to take it on trust though, as you suggest, it's easier to take something on trust when it's in the open (even if you don't understand it).

The previous system seemed to me to be done by a series of lookup tables which was sensitive to the difference between to the players and applied fixed increments/decrements in 200 BKR bands. What is done now I haven't had enough time to notice.