I've finally come to the realisation that either Pre Post or Opening Price or Starting Price should be a part of any simple system one develops. I've got a couple of decent systems, very few bets mind you, and both have been improved quite significantly with SP filters between and including 4/1 and 9/1.

Pre-Post seem to be a good place to start a system off, but aren't these odds just a reflection of someones rating system? I think they are, and I still can't get my head around why I should be following someone's rating system. Everyone else seems to be doing it and that's not a good thing for a decent POT.

I think that the bookies Opening Prices would be a far better guide than a ratings service or Pre-Post odds (I'm assuming these are based on a ratings service).

So who's right ..... bookies or a ratings service ?????

The bookies openers might be telling us some stuff that we don't know.