Here is another laying system that should work.

Lay all RADIO TAB top selections where the unitab rating is not 100.

The theory is that radio tab tips are followed by the average punter and that they are also usually the same tips given out on sky racing. This causes a lot of people to bet on the selections making the price drop so that there is no value in the selection.

While I know betfair punters are perceived as "smarter" I beleive the odd lines still follow what is available on the totes ( just add 10%-30% to the price).

I have removed selections that are also rated 100. The reason being that horses rated 100 have a high strike rate and would be break even using betfair prices.

Any Thoughts ?

You won't win everyday but you should (if my calcs are right) generate a POT of around 3% and considering there are a lot of selections each day this could turn into a nice little profit at the end of the year.

Good Luck.