Showing posts with label WBF. Show all posts
Showing posts with label WBF. Show all posts

8 December 2014

EBU Panel Weekend

The EBU TD panel consists of those TDs the EBU will use to direct at its events, including trainees who serve a probationary period before “donning the purple” blazer, or not. (We no longer have purple/maroon blazers, so I guess it should be “donning the red polo”). Every two years, the panel meets for a weekend away to share best practice and remind ourselves how to sit in a bar until “a bit after two”. Some topics come up two-year after two-year, and a workable and consistent approach to Law 27 is such a topic.

One more go at Law 27 (2007)

It is getting to the stage the new Law 27 is no longer new and in a few years will become the old Law 27. We (EBU TDs) continue to oscillate about what the different players at the table should be told about the options available to the offender in replacing his insufficient bid. I think the truth is that we do things differently depending on the auction and the experience of the players at the table. We also continue to discuss particular cases of what calls constitute “rectification calls” under Law 27B1(b) — that is, calls that will not silence offender's partner. Here again we oscillate between a more or less liberal interpretations of the law. But there seem to be nothing much to be learnt as general principle, but just to look at each case separately.

The case we looked at was 1NT –(3♦)– 2NT; with responder holding ♥AJxxxxx. The point of the exercise was to distinguish the application of Law 27D (after Law 27B1) from the application of Law 23 (after Law 27B2). But we had to know whether a replacement bid of 3♥ would silence partner.

Responder intended 2NT as Lebensohl but was confused about what auction he thought he was bidding Lebensohl in, so it was not clear if his intended 1NT –(2X)– 2NT – 3♣ – 3♥ was to play or invitational. It was also not clear whether the partnership had an agreement as to whether 1NT –(3♦)– 3♥ was invitational or forcing. So we were forced to conclude that 3♥ as a replacement for the insufficient bid did not necessarily have the same meaning as 3♥ after the insufficient Lebensohl and so did not have the same-or-more-precise meaning as the insufficient Lebensohl.

We concluded that 3♥ would only be a non-silencing replacement bid, if responder knew what strength of 3♥ bid (to play, invitational or forcing) he was intending to show via Lebensohl, if the partnership (in particular, opener) knew what strength was shown by the proposed 3♥ bid, and if those two meanings (in terms of strength) co-incided. This all requires a lot of investigation by the TD during a live auction, possibly wanting to ask questions of both members of the non-offending side independently and without giving information to other players to which they may not be entitled.

WBF have another go with Law 27 (2017)

Meanwhile (in another part of the forrest) the WBF laws draft subcommittee are considering how to fix/improve this law. Any radical redrafting has been rejected: for instance suggestions that the insufficient bid should be an unauthorised withdrawn call (see open season on law 27). It is possible that the “meaning” of the insufficient bid, instead of being the “intended” meaing, becomes the “apparent” meaning (or the information conveyed by the insufficient bid). So the TD does not need to ask the offender what he was trying to do, instead he has to decide what it looks like he was trying to do. It is also possible that any unauthorised information generated by the offender (for example, “oops, I thought he had passed”) will be wound in to the restrictions on offender's partner.

We shall have to wait patiently and see what happens.

Coming up

So, there may not be much more to say here on Law 27 for a few years. At the panel weekend, I lead a session on scoring and we (again) recognised the value of sharing our experiences with the different scoring systems. So I might try and write up some details of scoring system problems and achievements over the last year and post them here.

26 October 2011

An Open Invitation from WBFLC

This appeared in the World Championships Bulletin No.11. I intend to respond: covering laws that have come up in this blog.

The Laws of Duplicate Bridge – An open invitation

by Grattan Endicott

The WBF Laws Committee is now giving some preliminary thought to the next review of the Laws of Duplicate Bridge. Its first decision is to issue a worldwide invitation to players, tournament directors, and NBOs (and as it may be, other members of bridge discussion groups), to send to me any thoughts they may have as to desirable changes in the Laws.

I intend to divide suggestions received into two categories:

  1. those which propose a change in the effect of the law; and
  2. those which retain the current effect of the law but target an improvement in the wording and/or layout of a Law.

The broad inclination of the committee as it commences the task is to institute very few category (a) changes but to concentrate mainly on proposals in category (b). All suggestions will receive consideration and we will see what responses this invitation brings.

For ease of identification and sorting, I request:

  1. That nothing reaches me before 1st December 2011, and
  2. That the subject line of every email shall contain the words “Duplicate Bridge Law”, which may be followed, if desired by a Law number.

Given the likely number of suggestions that will be sent, please do not anticipate an acknowledgement of receipt unless there is something not fully understood. Do not assume that anything received hitherto will be on record — send it afresh if you wish it to have attention.

Invitation issued Tuesday, October 25, 2011.

Responses must be received no later than 31st December 2012.

Send to grandaeval@tiscali.co.uk

19 January 2010

Both sides revokes: WBF minute

January is a good time for breaking resolutions! This is discussion of a hypothetical problem (against the stated policy of this blog) which arose from the recent WBF LC meetings. The WBF LC minutes are reproduced in the recent EBU L&E minutes. The item I am interested concerns both sides revoking on the same hand.

7. When both sides have revoked on the same board (Laws 64B7 and 64C), each revoke is examined separately in assessing the equity when that revoke occurs.

What does it mean? Or more accurately, what does the TD do? Having examined each revoke separately and assessed the equity, what does he do with the different answers to arrive at an adjusted score?

Extreme example

North
irrelevant
WestA
irrelevant--
A K Q J 6 5 4 3
C2 lead10 9 8 7
--
A
10 9 8 7
A K Q J 6 5 4 3

South plays in 3NT: North and West follow suit and can not win any tricks. South plays clubs from the top and East discards SA on CJ, and wins C6 with C10. East plays diamonds from the top and South discards HA on DJ, and wins D6 with D10.

South makes 8 tricks. Both sides have revoked: so we examine each revoke separately. Without East's revoke South will make 9 tricks. With East's revoke but without South's revoke, South makes 4 tricks; or 5 tricks if we apply the one trick revoke penalty for East's revoke. This gives two or three separate results: 3NT= and 3NT-5 (and 3NT-4); which one do I assign?

For what it's worth, my vote is for 3NT=, ignoring both revokes. But I don't see how this fits with the wording of the minute.

30 January 2009

WBF LC documents on the 2007 laws

The World Bridge Federation Laws Committee has recently produced two documents with interpretation of the new laws (or advice on interpreting the laws).

In particular, the Committee favour a liberal approach to Law 27B, noting that there is an inclination to allow artificial correction of some insufficient bids even in cases where the set of possible hands is not a strict subset of the set of hands consistent with the insufficient bid. This "mildly liberal interpretation" will allow play to continue; with Law 27D being used at the end of the hand, if the offending side have gained through the insufficient bid.

This appears to mean that TDs will ignore negative inferences from potential meanings of the insufficient bid, inferences which would exclude hands from the set of hands consistent with the insufficient bid, and so exclude some hands shown by a potential correction. So in the auction 1D-(1S)-1H, we would allow a correction to a double under Law 27B1(b), although some hands would not respond 1H (because they would bid a longer club, or spade, suit) but would nevertheless make a take-out double. If these negative inferences become relevant, the TD will adjust under Law 27D. As ever, we need to see more examples to see whether this liberalism will be for the best.

P.S. I have returned to work (see No posting in October), still with some medical issues to be played out. Hopefully, more bridge and directing in the coming months.