Courtesy of this forum Bernie, there would be 200+ decent systems that do have some logic as their base. A lot of them rely on last 4 runs, but there are many including others, including the 'longshot' system that provide some sound information for you to build a system that suits your style.

Many systems posted here show excellent POT results going back for 4 years from the time they were posted. Over the past few years the posts have concentrated more on "running your own book" and ratings based, rather than early days where information was shared in pursuing winnning systems without ratings. This doesn't suit me, but it might suit you bernie.