barmar, on 2019-February-19, 10:22, said:
It seems like the questioner is trying to find out whether the 4♦ bidder intended to jump or misbid because he misread the auction. A jump presumably has a different meaning than 4♦ over 4♣.
Sometimes UI is an unfortunate result of actions you feel are necessary (not to mention some that are legally required).
AFAIK there’s nothing in the Laws that allows you to find out whether a call or play was intended or a mistake. Law 75C implicitly states so IMO. If screens are in use, S asks W about the agreement without E knowing that - well, that’s the idea, anyway - so nobody will find out what it was till the board is played or the hand of the dummy is on the table.
As I wrote before, a misbid or any other mistake by your opponents might damage you, but there’s no redress. And more often it’s advantageous to the NOS.