"It's a fine line lomaca, and I'm not even sure how to properly explain myself".

Maybe Barny the difference is simply being able to justify to yourself why a certain perameter produces a certain result.

If you've got a good idea what might be causing the result, then I can't see what the problem would be to backfit that scenario. Just saying horses with R in their names win more often so I'll rule out all horses without an R or some such twaddle.... now that's backfitting.

This should not be perceived as an attack on the world famous, ever successfull "R System" however.

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"Not winning on a horse that came first is one thing.....Losing on a horse that didn't come first is something else entirely!!!"