I like Crashs' approach there, it reminds me of a strategy that I used for many years in the Uk successfully, though not as claer cut as that.

I basically used to watch or listen to the commentry of a race, and note down any horse that was prominent but just failed, even back to a close up 5th or 6th place, I nabbed some very good winners with this method, one that "SPRINGS" to mind is a horse called "Gus Demmy" which I nailed at 33-1.

Just an old timer reminising there, hope it doesn't offend!!