There is no way for South to show his
singleton ♠ in NS's system. Hence, South can only make a mild slam try by cue-biding once and
stop in 4♥.
Then, North is glad to accept the partner’s slam try of course with maximum and
all useful high cards. Well, he does not know ♠K is far less useful than ♦Q
or ♣Q
or even ♣J.
Anyway, NS reached the poor 6♥ with all AKs but it is likely to be with only about 23%, ♥Q
onside & ♥3-2 & ♣3-2.
Is there any better line?