In Case 5, the committee's explanation included:
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It strikes me that if east had doubled (or even passed), NS could have appealed along these lines: bidding on was a logical alternative, west's BIT suggests something extra, but with a hand that would make 5m a good contract, he would clearly have bid, so the hesitation must suggest defending. Since defending and bidding on are both LA for east, he must select bidding on -- the one not suggested by the BIT.
The committee seems to have based their decision on their feeling that "Players seldom take a long time considering whether to double, but more often are thinking about bidding." But, their explanation (quoted above) indicates that they think west "almost surely" would have taken action when it was right to bid to 5m.
Anyway, it seems to me that NS could have had it either way, EW defend 4♠, they appeal saying EW should bid on, EW bid on and they appeal saying EW should have defended 4♠.
It also strikes me as strange that EW bidding on over 4♠ turned their +50 (for defending 4♠) into -100 or more (for declaring 5m). That is, east took the losing action over 4♠. Maybe he should be commended for bidding on when the BIT made defending even more clear than it already was.
In Case 6, "West asserted that had he known that 3♠ was non-forcing he would have doubled." When the auction ends and the failure to alert is discovered, how can it cost for West to make this claim? If it turns out that it was right to stay out of the auction, the director is not called back. If taking action over 3♠ turns out to be correct, he calls the director back and says: "but, before the play started, I said I would have taken action had I known 3♠ was non-forcing."
Anyway, it seems that in both cases, the non-offending side had available something of a double-shot.
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A further question about Case 6. If East, before her final pass, had asked if 3♠ was non-forcing and North confirmed, shouldn't the director have been called at that point? An irregularity had occurred. And, if the director had been called at that point, wouldn't west have had the option of changing his last call? That is, East could have taken action to avoid the need for the director (or appeal committee) to apply his judgment to the situation. But, it was in her best interest not to ask and not to call the director because then her side would have extra options.
I'm not questioning East's ethics -- I think most of us would note the apparently forcing auction and pass thinking that the opponents had just experienced a bidding misunderstanding.