661_Pete Posted July 9, 2016 Report Share Posted July 9, 2016 What I mean is, I know (as probably everyone knows) about the points differential/IMP lookup table (20-40 -> 1IMP; 50-80 -> 2IMPs etc. etc.). What I'm after is, how is the baseline average calculated from which these IMPs are arrived at? And how do we come to get these odd fractions of an IMP - even after just one hand (which is usually played at 16 tables)? Is there a precise mathematical formula? Please understand this: I'm not complaining! I'd just like to know. Quote Link to comment Share on other sites More sharing options...
gordontd Posted July 9, 2016 Report Share Posted July 9, 2016 It's an average of the IMP comparisons of your score with that of the pairs in the opposite direction at every other table. So it will usually be a decimal even after one board. Quote Link to comment Share on other sites More sharing options...
barmar Posted July 9, 2016 Report Share Posted July 9, 2016 It's called "Cross-IMP Scoring", and it's explained in detail here: https://www.bridgewebs.com/crowborough/IMP%20Pairs%20FAQ.htm Quote Link to comment Share on other sites More sharing options...
661_Pete Posted July 10, 2016 Author Report Share Posted July 10, 2016 Thanks for the info. Now doing a bit of mucking about with Excel.... ;) Quote Link to comment Share on other sites More sharing options...
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