[blml] 60% session in IMPs

[John Probst]

----- Original Message ----- 
From: "Ben Schelen" <B.Schelen at IAE.NL>
To: "Bridge Laws Mailing List" <blml at amsterdamned.org>
Sent: Sunday, December 23, 2007 1:41 PM
Subject: Re: [blml] 60% session in IMPs


>
> ----- Original Message ----- 
> From: "John Probst" <john at asimere.com>
> To: "Bridge Laws Mailing List" <blml at amsterdamned.org>
> Sent: Saturday, December 22, 2007 4:06 PM
> Subject: Re: [blml] 60% session in IMPs
>
>
>>
>> ----- Original Message ----- 
>> From: "Robert Geller" <geller at nifty.com>
>> To: "Bridge Laws Mailing List" <blml at amsterdamned.org>
>> Sent: Friday, December 21, 2007 1:51 PM
>> Subject: Re: [blml] 60% session in IMPs
>>
>>
>> > Hi,
>> > In this case I agree completely with you that "the equivalent in
>> > imps of a 60% session" is not well defined.
>>
>> We know that over 28 boards, 60% is 49 imps. (Data from 20 years of YC
>> games, where we recorder the number of 60% scores and the spread of the
> imps
>> scores. However scores tend to increase at imps but decrease at pairs 
>> over
>> larger number of boards. Since a square root Law applies to each, we can
>> simply scale the imps to 20 boards; 20/28 x 49 is  35 imps.  We also know
>> that for Butler scoring the 3 imp award shoul be rooot 3 x 7/6. whuch is
>> nigh on 2 imps. This ties in nicely with the 35 imps for 20 boards.  If
> you
>> can be bothered try:
>>
> In the Netherlands 2 imps is recommended for butler sessions.

Of course. It's "right".  John
>
> Ben
>
>
>
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