evajb001 Yes I agree, that sounds as close as we can get so I'll settle for that. The plot thickens now though, what I'm thinking is either to always make the higher pre post price the no1 pick, or the other way round or split by some other means.

We now get into deeper water i.e. do we make the pre-post price the minimum accepted or no bet (basically using the PP as a rated price) or PP+a given % say 20% or no bet........