campboy, on 2011-January-21, 06:45, said:
It's all very simple. One day partner introduces a minor at the five level in an auction which is perfectly consistent with him having an eight card suit in that minor, so you have to play him for that. Next day he introduces a minor at the five level having already denied a long enough suit to do so, so you know something has gone wrong.
In the Ghestem case, if partner were a passed hand then pulling would be perfectly legitimate, because he can no longer have the hand with eight clubs.
You will have noticed that I don't often post in these threads, though I do read them from time to time.
But I wanted to better understand the current policy on UI (for personal reasons), so took part in the Ghestem thread, posted a problem I imagined I had faced and commented on the current thread that seemed, accidentally, eerily similar to the Ghestem thread.
The message I took from the Ghestem thread was that ignoring or forgetting that partner failed to alert is simply not possible: you immediately, irrevocably, have UI. You must bend over backwards to avoid using UI: prattling, as I did, about probability doesn't cut it.
But on this thread, it is argued that I can escape on the 'LAs' clause. Partner, the strong hand, driving this auction at least implicitly, tells me he prefers diamonds to my Hearts. But apparently I must forget his failure to alert, I must disregard it, I must bid on.
a)Was he cue bidding? Well, let's just say that xfer break after 4
♦ doesn't exist in our system, shall we.
b)He can't have long diamonds? I have played against some hignly distinguished opponents, where a normal 2NT turned out to include a 6-card major not even a minor.
My conclusion from this thread is that with this particularly virulent form of UI, the requirement is to bend over backwards, but not neceaarily very far.
So there has a learning experience for me, disappointingly ambiguous, but sufficienct to guide my conduct - that is, take account of text book cases, particlarly from the Netherlands, and bid as I judge otherwise.
By the way, I note with relief that Lamford's proposition that passing 5
♦ on this hand would be use of UI has so far not met disagreement (hmm), but at least has not met agreement.
Meanwhile I can vanish from attention for a while.