keithhus, on 2016-November-30, 17:22, said:
You seem to be asking "when is a deviation from disclosed methods illegal"? The answer is "rarely". A psych is, by definition, a deliberate and gross misstatement of honor strength and/or of suit length. if the misstatement is not "gross" it's not a psych. According to the EBU White Book, "a misbid is an inadvertent mis-statement of honour strength and/or suit length. A deviation is a deliberate but minor mis-statement of honour strength and/or suit length" (WB §1.4.1). You say you think you've been told 1 card or 2 points outside declared range is illegal, but it's not that simple. Did the player deliberately deviate from their agreement, or did he make a mistake? Generally speaking, if he made a mistake, there's no problem unless his partner expects that he did (from prior experience most probably). Even then, if the partner discloses the tendency to misbid, there's no problem. If he deviated knowingly from agreements, that in itself is not illegal either. The question is whether his partner has any more reason to expect the deviation (again, most likely from prior experience) then the opponents do. If not, there's nothing illegal here.
As for a 1 card deviation, consider this: a pair play weak twos, and agree that such bids normally show a six card suit. To say that opening a weak two on a five card suit or a seven card suit is illegal would, I hope you agree, be ridiculous. First, such a rule would obviate the player's judgement, and judgement is what the game is all about. Second, opening a weak two on a good five card suit, particularly in third seat, is common practice even among non-experts.
I normally play a 15-17 1NT opening. I've seen a lot of hands with 14 HCP with which I would upgrade and open 1NT. With some partners, we write "good 14 to 17" on our card and explain it that way. With other partners, I've stopped upgrading because they can't remember to disclose properly. With still others, we've never discussed upgrading and they don't notice when I do. There is nothing wrong with any of that. Okay, that's one point. Two points? I've seen a few 13 counts, usually with a five card suit, that "look like" a fifteen count, but I don't open those 1NT — but I wouldn't claim that someone who did made an illegal bid, provided the tendency to upgrade is properly disclosed. Get down to 12 HCP and you're in psych territory, but still not illegal if properly disclosed, or if, more likely, the bidder's partner doesn't expect it.
White Book §1.4, Psychic Bidding, is a pretty good exposition of the principles involved. I recommend it to you (it's a free download from the EBU website).
NB: regarding psychs and the expectation of psyching, it sounds like in your club nobody would ever expect a psych. In such a situation, if someone did psych (a deliberate action, remember) he will have done nothing wrong as far as the rules of the game are concerned — but club management might ask him to refrain from doing it again. That said, a club that bans psychs is not playing bridge according to the rules of the game, and if I were in charge of giving out masterpoints for such a game, they wouldn't get any.