Here's a system that I've been betting using Don Scott's ratings:

1 ) Must be rated at $1.50 or shorter.
2 ) Must have won last start or ran second.

I'm showing a POT of slightly higher than 10% with Place betting. I haven't really checked Win betting but there have been two winners that have paid double-figures on NSW TAB.

The drawback with the system is that not only can the divvies be skinny but there are many days without any selections, and because of this I often have not bothered to check.

However, there are 5 selections today so I'll list them and see what happens.

Belmont R7 no.1 - Marasco
Bendigo R3 no.4 - Mammy Jolson
Eagle Farm R5 no.3 - Fravashi
Flemington R3 no.6 - Toulouse Lautrec
Morphetville R4 no.3 - Favelon's Dream.