Posted 2011-January-27, 20:40
As David says, whether or not one "should" be able to work out what to do opposite whatever the cuebid shows is irrelevant. The nonoffenders don't *have to* have a defence to "random two-suiter", they don't have a defence to "random two-suiter", and they do have a defence to "majors" and to "major + clubs" (I assume "known major and clubs", be it two lowest or top+bottom, but I'm also assuming that "either major + clubs" is a legal meaning for the cuebid). They didn't have a defence to "random two-suiter", and not knowing what to do, South made a guess that may have been the poorest, but had the advantage of being unambiguous (even if badly misdescribing).
Definitely, if they're playing "random two-suiter", Illegal convention causing damage. I'm much less discriminatory about what is damage if you're playing something illegal for the game.
If they just can't describe their hands properly, I agree with David (again) that any peep out of South will get them to game, and South will make that peep if he knows the score. If East-West know what they're doing, they're getting a warning about incomplete explanations and misexplanations; if they really know what they're doing, or seem not to care, that warning will be in matchpoints.
And here I was reading the OP and thinking that the question was going to be "North led a club, and E-W complained about use of UI from the question."
In response to Ed: No, I don't think so. The original explanation was ambiguous, and the leading question was an attempt to resolve the ambiguity. "Which suits?" would have been a better question (mostly for the reason in the previous paragraph), but "could it include clubs?" is not conceiving of an answer other than "yes", if it does, or "no, the majors" if not. With Ghestem's popularity in England, the chance of it being Top and Bottom is quite high.
When I go to sea, don't fear for me, Fear For The Storm -- Birdie and the Swansong (tSCoSI)