At the table: North (partner) opened one club, I bid 3NT with a private message to the opponents that this showed 16-18. North remembered, as I did not, that we were playing 3NT as 13-15 and passed. Clubs behave and the heart finesse is on, so 6C makes. Only one pair bid it, I have no complaints.
However. Let's say I remember that we are playing 3NT as 13-15. What is my call? If you like, I'll stipulate inverted minors (we were not playing them but I like them). I could then temporize with 2C. Partner would bid 2H. Now what? I checked the full disclosure default card for BBO Adv. It says that continuations after 1C-2C-2H are all undefined. It seems to me that bidding 3NT now would probably be taken as having (perhaps just barely) the values for 3NT but with initial concern about hearts. Bidding 2NT is probably not even forcing. Bidding 3C over 2H would, as I understand inverted minors, be passable. Something like an eleven count and no spade stop, and presumably five clubs.
If you think I can just lie a little and slightly underbid my hand with my 16 count, up it a little to 17 and the same question arises. Actually I am not fond of "The bid shows 13-15 but if you have 16 you can fake it and bid 3NT anyway". Both ethically and strategically I think it is wrong except if done as the occasional choice with a very bad 16.
The one pair that got to 6C did it in the very old fashioned way, playing 1C-3C as forcing. Perhaps they are on to something. It seems we need to borrow from the Hippocratic Oath in designing bridge agreements. First, do no harm. The hand above is not exotic. It should be biddable.
Ken

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