It's all about the prices - which is why I sometimes have little or no notice. I won't bore you with the details and it's largely counter-intuitive because most of them will be drifters (obviously, whether they're drifting or not depends on a snapshot that you take at a certain time of the day so there's a lot of margin for error/interpretation). It started off with certain types of races with a certain number of runners and looking at how open the races were but lately I've been chucking a few others in that wouldn't have met the criteria before.
Looks like I've relaxed the criteria too far judging by the last couple of days, although the beauty is that a couple of winners can often wipe out a week's losses.
I'll be back for more tomorrow anyway