Here's one I came up with a number of years back because PPM were having a systems comp:

Must be 1400m +

Must be 1st up

Must be barrier 1, or barrier 9

And that was it. Genius system, won HEAPS the year I tested it. Could've sold it for several million dollars, no doubt. One of the finest bits of reverse engineering you'll ever see, that.

You should've seen what I wrote as my reasoning for it in the entry. What a crock.