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Club tournament, F2F.
NS are experienced players but not frequent partners.
The 2♦ opening is announced by North as Multi and on request of West, explained as "weak two in an undisclosed major OR a three-suited hand OR a strong single-suited minor".
South bids 3NT and all pass.
West leads ♦J and NS take 10 tricks for 3NT+1.
West calls Director, observing that South's hand and bid are not consistent with the explanation supplied and that he fears EW may be damaged in some way.
South says he assumed that Multi was weak two or 18-19 balanced and North says he expected that South would assume North's usual Multi.
At the other tables, all played 3NT, usually Declared by South and receiving ♦J lead. 3NT+1 was common.
How do you proceed and rule?
