Darcy,

There are a few of these going around. There is one in the Horse Racing Austrlaia Magazine from last year which was similar in that it concentrated on the Caulfield Cup and Cox plate races. Think it was within 5 lengths in these races then there were some other rules around it like recent win, barrier, age, weight, etc.

I am not home this week but when I go home I will try and find it for you.

Maybe someone else hasa copy and can postthe rules.

Good Luck.