I think it was mentioned by Darkydog as the De Grey system. I have a copy of it. Can't even remember where or how I acquired it. The one I've got is called 'A Touch of Genius' by Micheal de Grey published by the House of Montague circa 1989. Apparently the original was even older named 'The Isolator'

I think the House of Montague was the fictitious entity from where quite a few systems were sold by a Gold Coast con man. Whose name was Michael by a freak coincidence.

Anyway, that's all just for historical reference re old systems and the hyperbolic turn of phrase they used to market them .

The rules were, lowest pre-post fav at each meeting, no equal favourites.
I must admit that I never followed it so don't know how it would pan out