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4. (a) If a player realises during the auction that his own explanation was erroneous or incomplete, he must summon the Director before the end of the Clarification Period and correct the misexplanation. He may elect to call the Director sooner, but he is under no obligation to do so.
As far as I can see this is one of the few major changes to the Laws that will affect players: the fact that a player may wait to correct his misexplanation until after the auction is completed. Currently the player must call the Director immediately.
I find this change a little disconcerting as it seems to move away from the principle of trying to get a meaningful result at the table. If I describe my partner's two clubs overcall over their one no trump opening as the majors, and then remember it is clubs and a higher suit with this partner, then there is little chance of the opponents having a meaningful auction if I fail to correct this immediately.
Of course they will receive an adjusted score if they are damaged, but this adjustment will not be any easier for the Director that under the current Laws and may often be harder: he may well have to judge the auction and the play, as the final contract will often be different. I guess that there is little that can be done in cases where I realise that I have misexplained and the auction has continued with LHO having made two calls.
More importantly, what do you think we should advise our club players to do? Are they better off reporting the misexplanation immediately or should they wait until the end of the auction before the lead is made?