If their argument is that the only LA is to assume partner thinks we have clubs, we'll get that out of the poll, won't we?
"So, what's 5C?" "How can this auction exist?"
If we hear these questions, then that's how we go. But I bet we won't.
If you have a problem with that, how about a poll that goes "you have [hand]. Auction goes 1S-3C!-"What is it?" "Hearts and diamonds" "Okay, 4S"-5C; X. Your call?" David's hypothetical does in fact make sense, and is the way players have to go with it - if still the only logical alternative is that partner forgot, after explicitly hearing the correct information, then fine. Otherwise, it's clearly use of UI to come to the conclusion that partner forgot.
If that's too far, how about "1S-3C, showing hearts and diamonds, which partner Alerts. LHO looks at your card and bids 4S, 5C by partner, X to you." Now how many people pull? If it's not everybody, then it's not the only logical explanation that partner has forgotten, but that partner a) knows what he's doing, and
might actually have a mittful of clubs. Of course with this one, the people could be thinking that it's a "which two suits does 3C show" confusion issue - "he obviously thinks I have hearts and clubs", but then you'll get some 5D callers, no?
After all, this hand doesn't contain KJxxxx KQJxx, it's aces-and-spaces. Partner, with 9 clubs, even headed by the KT, could easily *make* 5Cx.
Maybe partner has a club void, and a big red fit, and is willing to risk 5C-11 (for -550, a nice score, w/r) to get the club lead against 6S. Sure, if he gets doubled, he'll run - if you don't take it out of his hands.
I don't like "partner obviously forgot" as an explanation in general - especially playing conventions that would be illegal if the "forget" auction was part of the agreed system - unless the call is a "he can't do that" bid. On the other hand, I decided to try 1NT-2C; 3C a couple of weeks ago, hoping partner would catch it, knowing it was a "he can't do that" bid. But, of course, I clearly couldn't have forgotten we were playing Stayman, right? Funny how "partner's obviously forgotten" only happens when it's convenient for the forgetting team, and even then, only in the presence of UI.
When I go to sea, don't fear for me, Fear For The Storm -- Birdie and the Swansong (tSCoSI)