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[george venter]

miss boarded board ( 16:33:49 SatSep 14 2002 )

a board was miss boarded by a sit out pair or the last one to play it east hand was put in n hand untill then east made 4s and then north made 4s so i gave that pair a avrage what should i have done

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Re: miss boarded board ( 23:45:42 SatSep 14 2002 )

For what infraction was "that pair" partly responsible, that you gave them an artificial adjusted score?

The board was fouled. You divided the field into two groups: those who played the board before it was fouled, and those who did so afterwards. You matchpoint each group separately. Then you factor the scores. See Law 87.

If you can identify which pair was responsible for the fouling, you can give them a procedural penalty under Law 90.

JimO

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Re: miss boarded board ( 04:55:47 SunSep 15 2002 )

I don't know where you are, but if you're in N. America, ACBL regulations for fouled boards in pair events:
As Ed said, you divide the field into two groups, then matchpoint each group separately.
If a board was played once if fouled (or pre-fouled form):
Each pair receives 60%.
If a board was played twice:
The better score receives 65%, the lower score 55%. (If they tie, each gets 60%)
If the board was played 3 times in one form (at least 3 in the other form):
The best score receives 70%, the middle 60%, and the lowest 50% (again, tie scores split these - e.g., a tie for top gets 65%, a tie for low score gets 55%, a 3-way tie gets 60%)
If the board was played 4 or more times, or 3 times where it is the larger of the two groups:
The factored board formula is used:
M = N/n x S + (N-n)/2n
where
M = matchpoint score
N = number of scores on a board, i.e., Top + 1
n = number of actual scores within the group
S = Matchpoint score within the group of n scores

There are other regulations for fouled boards in BAM of Swiss or KO Team events.

A procedural penalty should be imposed on the offenders.

[Edited By JimO at 04:57:54 Sun Sep 15 2002]

---
-Jim O'Neil
Oak Park, IL

bluejak

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Re: miss boarded board ( 02:58:35 TueSep 17 2002 )

It is not entirely clear from your account, George, exactly what happened after the fouling. If it was played once then as Ed says [well, he means to say :smile:

] average plus should have been given to both sides. If it is played more than once then it should be scored as two subfields.

Jim has given you the North American regs, which I think are dreadful [not Jim's fault :embarrassed:

], and were abandoned many years ago in Europe. They are based on not using computers. Nowadays the norm around the world is to score both subfields using Neuberg's formula, even if the subfield has only two scores.

What is Neuberg's formula? It is what Jim calls the Factored Board formula. But be warned: we do not know where you are but in some parts of the world [eg North America] you get half a matchpoint for each pair you tie with, one matchpoint for each pair you beat. In other parts of the world [eg Great Britain] you get double that. The formula Jim gives is based on North American matchpointing.

In England we use

 
(M x E) + (E - A)
----------------
          A

where:
M=match-points earned by the pair considering only the group itself
E=total number of scores expected on the board
A=actual number scores obtained on the board

This is in fact the same formula - it just looks different! :rolleyes:

---
David Stevenson <laws2@blakjak.com>
Liverpool, England, UK
http://blakjak.com/lws_menu.htm

JimO

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Re: miss boarded board ( 13:20:25 TueSep 17 2002 )

I agree that the ACBL reg is silly.
A pair goes for 1100 on a partscore deal and gets 50% of the matchpoints (instead of 7-8%), because the board had been fouled.
This happened quite recently.

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-Jim O'Neil
Oak Park, IL

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International Bridge Laws Forum

If you need help with the Laws or rulings from any country in the world, this is the place!Hosted by David StevensonSenior Consultant DirectorEnglish Bridge Union

If you need help with the Laws or rulings from
any country in the world, this is the place!

Hosted by David Stevenson
Senior Consultant Director
English Bridge Union