Re: BUM-RAP Redux
- From: dranon <dranon@xxxxxxxxxxxxxxxxxx>
- Date: Tue, 07 Apr 2009 19:58:25 -0700
Sod off.
On Tue, 07 Apr 2009 17:55:07 -0400, Stig Holmquist
<stigfjorden@xxxxxxxxxxx> wrote:
Nine years ago the computer programmer of Python, Alex Martelli,
started a revival of the 1935 Four Aces point count method, viz.
3-2-1-0.5, in the Bridge World. It started out as a doubling of the
4A's scale but after extensive discussions on RGB he adjusted it to :
4.5-3-1.5-0.75 and added 0.25 for the ten card to make it compatible
with the Work count(W) He called the new scale BUM-RAP(B-R)
This new scale is deemed to give a better nominal HCP count.
The difference between the two scalaes can be significant for weak as
well as strong borderline counts. E.g four quacks (Q+J) count as 12 W
points but only as 9 B-R points and four Aces count as 16 on the W
scale but as 18 with the B-R count. Add four tens to each hand and the
B-R count goes up to 19, while the W count remains unchanged.
Many more examples could be cited.
It's easy to revalue one hand but laborious to do so with an entire
print out of 36 deals from a tournamen to determine if the set is as
average as one can get from a DMPro set. But it can be simplified.
The B-R count can be expressed as A(4+0.5) + K3 + Q(2-0.5) + J(1-0.25)
+ T0.25, which can be rewritten as 4A +3K + 2Q + J +0.5(A-Q)
+0.25(T-J).
Thus by just counting the number of each honor card in the set and
inserting it in the formula one can more easily revalue a print out.
E.g in one set of 36 deals from DMPro I counted 40A's + 35K's + 27 Q's
+ 38 J's + 38T's for a total count of 363.5 vs. 357 W points for the N
hands. Thus it was 1.82 % stronger on average with the B-R count.
On the same print out the W hand had 392 W points but only 382.5 by
the B-R count, a loss of 2.4%. Individual hands would show greater
deviations.
Since a perfectly average hand will have one honor card of each rank
it follows that a hand will change 0.5 pts for each (A-Q) and 0.25
for each (T-J) difference. Thus all one needs to do is keep the Work
count and adjust it with half the (AQ) + a quarter of the (T-J)
count. This should not be too hard to do as a post mortem study,
and unless one suffers from innumeracy ond should be able to do it for
each hand at the table.
Please keep in mind this is only a proforma nominal evaluation.
I woder why Bergen did not acknowledge Martelli's contribuion in his
article in the Bridge Bulletin last year about Adjust-3, where he
simply mentioned the scale as a computer derived method. Is Bergen not
familiar with intellectual property rights for others?
Stig Holmquist
.
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