I've got a decent database and I delved into historical data with my filters and came up with quite a few systems that would have given me a POT of well in excess of 50%, several in the 90's%.

As I've posted before one simple filter can turn a break even system into a decent POT. As I've also posted before, since using this database I've discovered that there's a fine line between winning and losing.

My filters are my filters and a re not the common ones "everyone" seems to regard as non-negotiable. I think it weould be nigh on impossible to develop a systemw without a database because when you pump hundreds of different filters in, you see which one's positively affect the POT, you see which one's reduce the number of bets. You get a feel for useful filters.

I'm quite sure I could go on without the database now and develop a few successful systems, because I'm using filters I never thought of previously. I'm looking inot gear changes at the moment. Blinkers on first time seems to have a decent affect on 10% to 20% of horses and I'm guessing that the younger the horse the more it will help them before they get into bad habits. I also like tongue tie on first time.

It might be just as simple as looking at prepost of $4.00 to $11.00 and finding the one horse that on form simply cannot win. Someone has rated it a chance, and prepost for whatever reason is a good guide, so by avoiding the popular filters you might be giving yourself the chance of getting well over the odds.