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When a pairs tournament is scored in IMPs, what defines the baseline against which your performance is measured on a hand to get an IMP score? Is the the median result for players with your cards? Average result?
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Question about IMPs on BBO
#2
- Secretary Bird
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Posted 2022-February-04, 09:58
On BBO, and most IMP pairs tournaments in the last 20 years, the game is scored by "Cross-IMP".
Which means that your result (N-S, say) is compared one-to-one with *every other* E-W pair that played those boards (in the main club, up to 15 others; in tournaments, however many) as if they were your teammates. Those IMP scores are added up and divided by the number of comparisons (sometimes "comparisons-1". There are reasons for that, but it doesn't matter much) and that is your score.
You will hear rumours the word "datum" on the wind. Please ignore them. Datum comparison hasn't been used in the last 20 years, in any event worth playing in. And the people who refer to datum scoring don't know how it used to work anyway. "Cross-IMP; compare against all other pairs and average."
Which means that your result (N-S, say) is compared one-to-one with *every other* E-W pair that played those boards (in the main club, up to 15 others; in tournaments, however many) as if they were your teammates. Those IMP scores are added up and divided by the number of comparisons (sometimes "comparisons-1". There are reasons for that, but it doesn't matter much) and that is your score.
You will hear rumours the word "datum" on the wind. Please ignore them. Datum comparison hasn't been used in the last 20 years, in any event worth playing in. And the people who refer to datum scoring don't know how it used to work anyway. "Cross-IMP; compare against all other pairs and average."
When I go to sea, don't fear for me, Fear For The Storm -- Birdie and the Swansong (tSCoSI)
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