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Mathematics of a split score with added SEWoG EBU

#1 User is offline   Cyberyeti 

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Posted 2011-September-25, 14:38

In this case, what the ruling is has been decided and agreed, but nobody here understands the white book well enough to actually do the calculation and provide the IMP scores.

Teams of 4, NS vul. Result from other table EW 3-1 NS +50

What happened at the table in question was the auction started with west opening 1N-X-XX-P-P with the XX explained as business, systemically weak take out into a minor. With correct explanation N passes this out and collects 600. However N removed with the MI and NS took a SEWoG shot later in the auction converting 3= +140 to 3N-1 = -100.

EW get a table result of -600 for -11 IMPS

Am I right in thinking the mistake cost +3 IMPS (for 140-50)- -4 IMPS (for -100-50) = 7 IMPS so NS get 11-7=+4 IMPs ?
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#2 User is offline   RMB1 

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Posted 2011-September-25, 15:41

View PostCyberyeti, on 2011-September-25, 14:38, said:

EW get a table result of -600 for -11 IMPS


You mean EW get the result of the adjusted score: -600 for -11 IMPS

View PostCyberyeti, on 2011-September-25, 14:38, said:

Am I right in thinking the mistake cost +3 IMPS (for 140-50)- -4 IMPS (for -100-50) = 7 IMPS so NS get 11-7=+4 IMPs ?


Yes.

I have a spreadsheet for these calculations that I mean to smarten up and release to the world.
Robin

"Robin Barker is a mathematician. ... All highly skilled in their respective fields and clearly accomplished bridge players."
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#3 User is offline   Cyberyeti 

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Posted 2011-September-25, 16:57

Thanks Robin, result transmitted to the county scorer.
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#4 User is offline   bluejak 

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Posted 2011-September-26, 07:03

Don't forget you can always find the numbers of the top EBU TDs [and others, of course] in the EBU diary and on the EBU website and ring them for help of this sort. If you want to ring someone after 11.30 pm try me: if you want to ring someone before noon, don't try me!!!!!
David Stevenson

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Visiting IBLF from time to time
<webjak666@gmail.com>
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