DaveB, on 2015-April-29, 13:08, said:
as North will have only 3 card support on the vast majority of occasions.
Equally he has a totally obvious 6♦ bid over an invitational or forcing 5♠ bid.
In what was a highly unusual auction which was unlikely to be tempo sensitive (even if that was not how it turned out)
and with potentially large number of imps resting on getting it right it appears highly likely
that South would consider carefully the meaning of 5♠.
I gave the auction to a partner of mine and his unprompted reaction was "What the hell is 5♠!"
You have allowed your belief in S's pure motives to influence your views. What S was thinking is irrelevant, and this notion that it is important causes all kinds of ill-will (there can be exceptions to this statement...if S was thinking over an explanation of a conventional call by the opps, for example, or if someone had spilled their drink all over his cards, but his hand-related thinking is irrelevant).
The only issue is whether the BIT would logically suggest that S was thinking about bidding slam. It matters not if there are other innocent explanations...maybe, unknown to N, S had been reading a newspaper waiting for the bidding tray to come back (assuming screens) or some other completely innocuous matter.
If there was a BIT, that ends the concern with the behaviour or reasoning of that player. We shift now to an objective view of what effect that BIT is probably going to have on N. There is no plausible reason for thinking that N would not at least contemplate that the BIT had arisen from S thinking, for whatever reason, of bidding on. Once we accept that...and I stress we do not need to find that this was the ONLY inference that could be drawn, then N cannot choose to bid if there is a LA that is not, itself, also made more attractive by the BIT. No way could the BIT make passing more attractive than bidding, therefore bidding is not permitted.
It also makes no sense for a TD to listen to claims that N wasn't sure that pass would be forcing. It is just too convenient an explanation. At best the TD could poll players he thinks to be of equivalent status to see whether this is plausible, but he cannot make that ruling based solely on the assertions of the players. TDs are NEVER to get involved in making rulings based on having to make credibility findings about the players' honesty in situations of this nature.
If that poll persuaded the TD that N wouldn't know if the pass were forcing, then and only then could the TD decide whether N's real choices lay between defending, doubled or undoubled, or bidding slam. Only then, in my view, would it be reasonable to compare the merits of bidding as opposed to defending...and then it is possible to conclude that in the absence of the BIT, passing was simply not a LA, for the risk/reward factors outlined before.
Btw, my sense is that you were one of N-S. Am I correct?