But I am with Justin in wondering why you are upset at the explanation of the 5♦ bid.
To me, the outcome of this hand depends on the hand held by the 4N bidder. If he had both minors and dubious ♥, it seems likely that he intended 4N as takeout and then catered to his partner's possible keycard response. I would, as committee or director, at least strongly consider making them play in 5♦.
Also, if responder's hand makes it clear that he intended 4N as keycard, I would want to know what a 5♦ keycard response would show. Let's assume, for example, that they play 1430. Now 5♦ shows 3 keycards. If overcaller held only 2, and 3 would suggest slam, I might force the 4N bidder to bid 6♥ (unless it made
The problem does not lie in the explanation of 5♦ but in the unauthorized information contained in the 'undiscussed' announcement.

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