Trinidad, on 2013-January-11, 16:52, said:
So, my order of priorities is:
Could this strange bid possibly have any meaning that is consistent with the start of the auction?
If so, I will assume partner meant to convey that meaning.
If not, then we have a misunderstanding. Psyches are not in my field of view.
Indeed if in fact partner did have a psyche and I correctly diagnosed that from his unexpected bid when there are other plausible explanations, I think that would be illegal too.
There is another possibility, which is different from a misunderstanding or a psyche, which is that partner made a mistake. I say that this is different from a misunderstanding, because mistakes include miscalculations from correct understandings, and things like inadvertently making the wrong bid and not being in time to correct it.
If partner passes my 2D unlimited transfer to hearts, it is a much more likely explanation that partner made some kind of error than that he actually holds diamonds. Fielding misbids can also be a CPU problematic. But it has to be either a mistake or a psyche, since there really is no sane reason for passing an unbounded weak-to-very-strong transfer if you have even a deviant 1N opening bid. I think misbid is the more ethical diagnosis, especially in fact if partner is known to psyche from time to time, so I really can't field his psyches unless they are completely exposed to view. If in fact it is me who made the mistake, and I can know this from UI, then the UI bars me from waking up to that error. So, unless I really am behind screens, I feel ethically bound to act on the assumption that partner made the mistake, not me.
That is the advantage of screens - you don't have the UI and are not constrained from making the "balance of probability" diagnosis. But if you don't have the screens, you have the UI and are constrained, and cannot necessarily take the same action you could behind screens. With screens, I am allowed to wake up to my error, or decide my error is the most likely explanation.