jallerton, on 2011-January-01, 14:27, said:
That chain of logic is quite a stretch. Players who do not complete their convention card properly could be aware that they might be providing misinformation, but it's probably never occurred to anyone before now that advantage could be gained in the manner you describe.
It had occurred to me before I read this thread. I don't think I possess any special insight into this sort of situation.
It's no different from a player failing to announce his opening notrump range, causing an interested opponent to ask the range, thereby creating UI for the other opponent. There was a thread about that in this forum a few weeks ago.
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In any case, had West instead looked at the convention card and found the information required, his partner would presumably have seen the reading of the convention card and still have received the UI that West was interested in the meaning of double/2♣ (The Year End Congress is not played with screens).
In Mike's original post, there was no suggestion that West had been seen to look at the convention card, but "West says he knew [what the card said] at the time."
If we believe West, he had contrived to read this part of the card without conveying UI. I don't find that hard to believe - I often have the opponents' convention card open in front of me, and others do likewise.
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Assuming that West is not an "always ask" person, the problem was caused by West. If West is not going to double 2♣ on being given the actual explanation, I can't see what different meaning of double would have persuaded him to act. In that case, passing in tempo without asking would have avoided giving partner any ethical problem.
Perhaps West's action would depend upon the meaning of the double. If, for example, double showed both minors, West might bid 2
♦. Or, more likely, West knew that to consider every possible meaning of this double, and the appropriate action in each case, would take so long that it would create UI anyway.
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It's also interesting to note that another way to avoid this situation is for East (the 1NT opener) to ask about the double of 1NT. It's hard to accuse East of conveying UI of significant extra values or any particular suit holdings in this position.
Yes, I always do that. However, we are told that East was "weaker", so perhaps he can be excused this omission. Also, as you mentioned in your earlier post, the EBU's recomendation is not to ask unless you are considering acting. It seems unfair to expect East to have a better understanding of the rules and their consequences than the authors of the Orange Book.
This post has been edited by gnasher: 2011-January-01, 18:44