Well, I wouldn't open as west. I think that 2
♦ is dreadful (or worse)
So as North I would open 1
♣, and get a 1
♥ overcall.
South has no reason to bid.
West now bids: I would choose 2
♦ unless playing transfer advances: then 2
♣ is in order.
North has a freak and the red suit bidding by the opps increases his chances of finding at least a tolerable fit in partner's hand.
I would bid 4
♠: this must be a powerful 5=6 or better.
East will bid 5
♦, as a 2-way action.
Now South can judge that NS has almost no defence to 5
♦ and so should bid 6
♣, again as a 2-way action.
Now West has a nightmare decision. His hand screams that the opps have hit a home run, but he is vulnerable.
I do believe that he can logically bid 6
♦. The key is that he can expect that his
♠ king will remain safe: surely S does not hold the
♣K and the bidding suggests that South will not be ruffing the second round of
♠. Whether I would be brave enough to bid 6
♦ at the table is a question I cannot and will not answer
Note that this hand is bad for transfer overcalls: 6
♦ by East is much less attractive
'one of the great markers of the advance of human kindness is the howls you will hear from the Men of God' Johann Hari