It might be unlucky for both of us to give my methods, but what I suggest you to do is go to Adrian Massey's website, www.adrianmassey.no-ip.org .Click on favourite statistics then after you've absorbed that click on custom report. Then start playing around. His database is over 10,000 races, all UK though. There are some sweet spots to be found wherein the return POT actually exceeds 100% for the Backers. Keep playing with it every possible condition is editible. For instance in the last 10 years 1st Fav's with a SP of 5-1 to 15-2 had a win stike rate of 12.9%. What does that tell you if you're laying, it has a 87.1% chance of losing. You then need to apply this research to Betfair stats locally.