nige1, on 2016-January-12, 19:20, said:
The UI from East's failure to alert is a mild indication that East believed West's 3♣ to be natural but, IMO, not enough to exonerate West from telling the director what he thought it meant when he bid it. I agree with Blackshoe that, even if the partnership really had "no agreement" and West sadistically made a meaningless bid, he must still call the director to confess to that rather than risk the opponents believing that the systemic meaning was "natural".
I didn't say that. At least, I don't think I did. This is an MI situation, not a UI one. If a correct explanation of the partnership understanding is given, the partner of the explainer has no obligation to "correct" it, even if he intended his bid as something else. If an incorrect explanation is given, the partner of the explainer must correct it, even if the incorrect explanation accurately describes what's in the partner's hand. But they better be thinking about why the explainer was able to correctly describe his partner's holding, if their agreement was something else. They may have to revise their understanding.
nige1, on 2016-January-12, 19:20, said:
It seems that Blackshoe agrees that West's 3♣ was a cue-bid although he dislikes the term.. South had bid a 3-card suit, as is often the case in a pass/correct auction. Hence, systemically, West's 3♣ might be intended as either natural or a cue-bid. East seems to have treated it as a cue-bid (although he might claim it was a lucky guess).
IMO, until East's failure to alert, West is likely to have believed that the systemic meaning was cue-bid, and absent evidence to the contrary, the director should assume such misinformation.
I don't dislike the term. And I'm not sure whether 3
♣ was a cue-bid, because I couldn't find a definition of that term in the blue book. I'm also not sure whether "pass or correct" is considered natural or artificial in England. I'd guess probably artificial, but it does say "if you have clubs I want to play in 2
♣, if you have diamonds I want to play 2
♦ (or possibly more, since if his partner has diamonds he'll get a chance to bid again)". IAC my point was that "cue-bid" is inadequate as an explanation of the partnership understanding. More needs always to be said.
If the partnership agreement on this auction is that 3
♣ is artificial, it requires an alert. If the partnership agreement is that 3
♣ is natural, it does not. At least, that's how I understand EBU regs.
If the evidence (statements, system cards, notes) indicates that 3
♣ is artificial, then there was a failure to alert, and that constitutes MI. If the evidence indicates that 3
♣ is natural, then there was no failure to alert. If the evidence is not clear, then the TD must decide which it is. If there is no evidence that 3
♣ was natural, then the TD shall rule that there was MI, but in general that will be rare, IMO. Remember that even a self-serving statement is evidence.
MPs lead ♦6 Table Result EW+620
A friend asks me about the above hand at a team event of County B standard, just below Life Master perhaps. Redouble and 2C were both alerted and explained correctly. West's 3C was not alerted, and North did not want to double as he thought that would help the opponents. There was no statement before the opening lead by dummy that there had been a failure to alert. The TD established that there was no agreement about 3C and North stated that he would have doubled 3C if it had been alerted, and his partner would have led a club, which would defeat the contract. The TD ruled that there was no clear agreement, but did not address whether dummy should have said something before the opening lead. He allowed the score to stand. Do you agree with his ruling?