I have to fight the urge to tilt playing against auctions like this. I just tell myself its similar to an opening bid out of turn and RHO took a stab at 3N
The diamond could be from 7, 7x, 7xx, J7, J7x or J7xx (close, but positive attitude should still be the Q). Or it could be Q7, Q97. I don't like my chances there, but it might lead to an easy set.
I need to assume at least one of the round suits is running. If its clubs, we need to go passive (If declarer has
♦QJx, we still have time to shift). However, as Gnasher says, we will get endplayed later, so this doesn't matter much.
If hearts are running, are there any worries? Not many, we can stand to give up a trick with the wrong shift and still recover when pard wins the assumed
♣K. So to me, the main issue is engineering a cashout when both hearts and clubs are running.
A high spade works anytime a low spade does (except for a stiff K). I have the option of shifting when pard has the
♥J,
♣K and the
♦J. I also have the option of trying for
♦J7xx, although I'm guessing at that point.
A heart looks pointless, as does a club. It does nothing to sever ties to the closed hand, which looks only relevant when declarer has
♦QJx(x). If there are any club tricks available we will get them.
I'll sneak a peek at the movie now