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If north is going to bid a grand then maybe 7♣ instead and pull 7♦ to 7♥. Since partner will pass with equal length it never gets you to an inferior fit, and in a case like this avoids disaster.
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How could north X 4C with 5 hearts and a 1 suiter? After a responsive X south should never play hearts.
That was what we thought. North that he must be flexible after D. South that partner had a lot of room from 5NT to 7
♥ and a majestic leap to a grand hardly could be just Qxxx. Perhaps partner was planning something technical, had the double of 4
♣ been pulled to 4
♠.
Anyway, I (south) took half the blame, the rest went to the bad luck, we were having.
3♣-X-4♣-X
pass-5NT-pass-7♥
all pass