I have examined almost every system sold in the past 5 years using a database of 13 years Oz racing.

Just as Ian Barns (RIP) showed year after year in Punter's Choice I have found no system that lasts more than a month or two.

A system is easily generated by going back over the past year or so and finding some "Platinum" characteristic that sits within the 'group' that made up the winners. What the purveyors NEVER do is split the d/b 80/20, run the research on the 80% and then test against the 20% so that the results aren't already contained in the research data.

Roger Biggs calls these short term aberrations "data clumping".

There's no surer way of going broke than following a 'system' over the medium to long term.