I realize I still haven't posted my opinion on the original question, and David's post gives me a nice opportunity to do so.
dburn, on 2015-May-11, 11:02, said:
The opponents are allowed to know what is true: "We have agreed to play Widget, but we have not discussed in any way how Widget operates (although we do know when it operates)."
I assume we all agree that this is the minimum information that the opponents are entitled to. But I don't think this is sufficient. Let me start with some extreme examples, that I think we all agree on:
- "We play BART as discussed in The Bridge World March 1986, page 43" may be a complete representation of the partnership discussion, but it is evidently not full disclosure - this sentence doesn't have the same meaning to someone who has not read, or do not remember page 43 on said The Bridge World edition. The opponent should be entitled to a description of the relevant parts of page 43.
- Let's say partnership X-Y has discussed "We play 2C has Acol Two in one major". The opponent Z doesn't know how strong of a bid and Acol Two typically is. Clearly (in my view) Z is entitled to an explanation of how strong an Acol Two typically is. But what do we do if X and Y have slightly different notions of what an Acol Two shows? Clearly, Z is not entitled to the knowledge that X and Y have different expectations for an Acol Two. At the same time, if he doesn't get any explanation about its strength, X is in a better position than Z when Y opens 2C, as he probably isn't that far off. And even if X realizes that Y's hand doesn't match his
expectations, he probably is in a better position to guess how he deviates than Z: someone for whom "Acol Two" is a sufficient description in a partnership discussion, is more likely to realize "Oh yeah, now I remember that some people actually think of Acol Two a bit stronger than what it
really is supposed to show", and proceed to correctly guess Y's strength, than a random opponent. So what information is Z entitled to? In my view, it's something along the lines of:
"Acol Two" most typically shows [insert your description of its strenght], but some play it a little bit stronger. Anything less does not give Z the same chance of guessing Y's hand as X does.
- Let's say a partnership agrees to play "2D is Ekrens, with standard continuations". Again, I think the opponents are entitled to the an explanation about standard continuations after Ekrens.
- Now to widget. Similarly I think that the opponent should be entitled to an explanation of the form
Some think it shows A, some think it shows B, but really it shows C. (I still haven't figured out whether C should really be included in that explanation as a possibility - I would tend to think yes, but I could be talked out of that.) Again, I think someone for whom "we play widget" is sufficient in a partnership discussion will be in a better position to work out partner's holding than a random opponent - even when it turns out that they think it shows A and their partner think it shows B. They may know which problem "widget" is trying to solve, or they may know other conventions that apply in this situation (and be able to work out that their partner mistook "widget" for that other convention), etc.
Indeed, let's say during the play it becomes apparent to everyone that the person making the bid cannot have a hand matching agreement "A". We set up a competition between his partner (who thought widget shows "A") and one of the opponents (who is only told that partner thought it means "A"); the goal is to work out bidder's actual hand. You have to put money on who wins this competition. Would anyone pick a random opponent? I would always pick the partner.
So what do I base my opinion on?
- On the principle of full disclosure: the opponent should be in as good a position to work out someone's hand as their partner.
- On the laws. Yes, a partnership is only required to disclose "partnership agreements". But once you parse what it means to make an agreement, you cannot just use recite words that happen to have meanings to some players, but not to others; you have to give opponents an equal chance to work out the meanings of these words as the two parties having this partnership discussion.
The easiest way to count losers is to line up the people who talk about loser count, and count them. -Kieran Dyke