Phil, on Apr 1 2010, 06:05 PM, said:
Related to 22B.1 and 21B.1.a, is if NS never disclose the agreement, or EW never ask, what happens after dummy is faced and the failure to alert is found out then? Since the auction period is over, West can't take back her call any more, but the Director won't issue an adjustment based on the MI, so the best EW can do is a split score.
Doesn't make sense to me

There is some difference in rulings depending on when misinformaiton comes to light. But I don't think it necessarily applies in this case.
If the misinformation does not come to light before dummy is spread, the offending side have committed two infractions: failure to alert 3
♣, and failure to correct the failure to alert once the auction has (apparently) finished. The offending side should get an adjustment to 5
♣X and a procedural penalty (warning or fine). But neither of these need benefit the non-offending side.
It is the concensus of this thread that failure to X 5
♣ was a serious error regardless of the (lack of) explanation of 3
♣, and implicitly that there should a split score. The law that requires a split score is Law 12C1b, which requires "a serious error (unrelated to the infraction) or by wild or gambling action". I don't think failing to double can be wild or gambling, but I accept that failing to double was a serious error. But I do not think that the serious error was "unrelated to the infraction": we are adjusting for the offending side because the non-offending side were likely to avoid their error given the right information. So I do not think Law 12C1b does not appy, and the adjusted score 5
♣X-4 should be awarded to both sides.
The application/interpretation of "serious error (unrelated to the infraction)" in the 2007 Laws is not yet fixed but I think the above is a reasonable approach.