[shevek]

We've all had this.
Local duplicate, 3 cards to go, someone notices a defender with 4 cards.
67B1 says
"the director establishes which trick is defective"

This can be a nightmare. Maybe declarer has been running dummy's suit and one defender has been a bit off the pace.
You can't tell them to play it out first, have to go back trick by trick. However this entails turning over quitted tricks, maybe heaps of them. Even then, there may be no way to decide which trick is the dud.
Any tips to handle this?

So you eventually work out which trick is problem, then have to tell the defender he has revoked. That seems a bit mean.

[Bbradley62]

It's mean to expect players to actually play a card on every trick, and punish them if they don't?

[bluejak]

I think we are too lenient in our approach to people who spoil the game for others. I do not ask much of opponents, but expecting them to play to each trick seems reasonable, and I believe the should be punished if they cannot do this, yes, why ever not?