I have recently been on a UK forum. One thread is a draw for course system. They have the bias of each course and this bias is quite large. Ie 45% of winners from low draw or 50% from the highest draw on another. One course is so biased that it would pay the trainer not to send the horse to the track.

The group doing this has been at it for some time with really good results from dutching the three or four horses in the respective draw.

Thanks for the input all you forumers