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How exactly are IMPs calculated? In the MBC and other casual play rooms

#1 User is offline   661_Pete 

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Posted 2016-July-09, 15:56

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.
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#2 User is offline   gordontd 

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Posted 2016-July-09, 16:51

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.
Gordon Rainsford
London UK
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#3 User is offline   barmar 

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Posted 2016-July-09, 17:17

It's called "Cross-IMP Scoring", and it's explained in detail here: https://www.bridgewe...Pairs%20FAQ.htm

#4 User is offline   661_Pete 

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Posted 2016-July-10, 05:24

Thanks for the info. Now doing a bit of mucking about with Excel.... ;)
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