[cnszsun]

Scoring: IMP

(ps)-1♦-(1N)-2♥
(2♠)-3♦-(3♠)-ps
(ps)-4♦-(ps)-ps
(4♠)-AP

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1, with south's hand, do you prefer 5D?
2, south bid 3 times and pushed opps to 4♠, is it normal action?

[P_Marlowe]

Hi,

Simply speaking, if you dont know, what you do over 4S
dont bid 4D.
As it is, I would have passed 3S, 3D showed your hand.

More generally, if you never try to defend with 4 in a minor
over their partial, you will be more often right than wrong.

With kind regards
Marlowe

[hotShot]

The South hand has a lot of worthless honors strength. Assuming that the 1NT overcall requires something like 15-18 HCP, North and East are left with less than 10 HCP.
It seems quite obvious that North and East share only 3♦.
(Why didn't North support ♦ if he has 2 of them?
On what distribution would East rise to 4♠?)
It seems likely that North and West hold a long major with 6-8 cards and a similar distribution pattern like South's 8221.

I think 3♦ is not the bid that is required here. Reevaluating the South hand, should reveal that has only 10 working HCP and 5 loser (and only 1 defense trick and it's not sure to make this ♥A). It should also be obvious to South that North 2♥ bid was made on distribution and not on HCP strength.
So South should have bid a preemptive 4♦ to keep West from showing support to ♠ or even better pass 2♠ hoping that opps don't bid game.

Forcing opps into a 4M contract that has chances to be made on distribution makes very little sense.