dburn, on 2011-February-14, 16:57, said:
I don't expect that 1♦-1♥ showed spades. They were probably playing transfers only over takeout doubles of 1♦ (or at least, one of them was).
This is horrible. North simply cannot bid 3NT after 1♥ has been alerted as spades. Why shouldn't East have a lot of black-suit cards, and have decided to bid clubs because North has just bid spades? Why shouldn't West have a strong jump overcall in spades, and be passing 3♠ just to see what will happen (he knows that North-South are in the middle of a cock-up, but they don't). I don't know about 6NT doubled down three, although I understand the reasoning behind it and could well imagine giving part of it as a weighted score. But "result stands" is... well, it is not even wrong.
helene_t, on 2011-February-14, 17:09, said:
I don't understand this argument.
If you are arguing that North might, without the alert, have thought that 3♠ was a splinter, then surely it doesn't factor in that North had shown spades. Since if he saw 3♠ as a splinter he wouldn't have been aware that he had shown spades himself.
It is a good case for not allowing North to bid 3NT that most people in the other thread voted that 3♠ is a splinter.
I just don't think it's very plausible. Also, it is quite possible that North, even without the UI, would have been woken up by the 3♠ bid itself. Since presumably he had discussed the transfers at some point. After all they were on the system card.
It is certainly possible that without UI, North might have wondered where all the spades were and concluded that partner had more than one of them. But without UI North is a free agent - he can conclude what he likes and bid what he likes (although I would wonder what, among the "stuff" that North-South play, the uncontested auction 1
♦-1
♠-3
♠-3NT might mean; there are those who do not play it as non-forcing).
But with UI, North knows that South is supporting North's "spades" (and may not have any heart support at all). That being so, he is simply not allowed to bid 3NT and hope that South will pass it (why in blazes did South pass it, anyway?) because there are always (or almost always) logical alternatives to the presumption that partner has forgotten the system. 3NT was basically another case of unauthorized panic - "partner thinks I have spades, so I had better bid something that suggests I don't want to play in spades". Note that this is different from "standard UP", where you bid a suit because partner doesn't think you have it even though you've shown it, but the principle is the same.