I come up with 9/13 in favor of finessing on the first 7NT hand , the one with KQTx of diamonds.
Calculated as follows:
#of ways. West has Jxx in♦ times the # of ways he can hold clubs divided by # of ways
West has Jxx♦ times # of ways ...
What about this hypothetical?
You are declarer playing a suit with eight pieces between
you and dummy. Both defenders follow to two rounds,
On the third round both discard. Is it good sportsmanship to
point out that someone needs to follow before the trick is turned?
Is it bad sportsmanship ...
Maybe I'm confused but, If south has say Jx and you pull one trump
why can't you overruff after the third heart and then finesse?
I see that you say south should not lead from Jx or 10x
but, I'm not sure why you say that?