I found this a rather fascinating hand
LHO is playing 4♥ on the given auction
Partner led the ♦9
The hand record indicates that EW can make 4♥
But not if declarer takes the ♦A at trick 1 sez DF
Let's say that declarer does win the ♦A and continues with a second diamond.
How do you beat this contract?
Here is the whole hand
Even looking at the entire hand it wasn't evident to me what switch would kill the contract.
I clicked on the button to show me the right card.
There was one
DO YOURSELF A FAVOR AND STUDY THE HAND BEFORE YOU CLICK ON "NEXT PAGE"
♠Q
Even after following various play lines with Deep Finesse it was not easy to see why only the ♠Q was the killing defense.
On the auction maybe an underlead of the ♠A will beat the hand. Leading a trump or club surely won't.
A diamond lead seems quite natural.
Let's say that declarer is 'on the ball' and ducks at T1.
South wants to cut dummy entries and leads back a trump.
It seems natural to win this in the dummy so that you can ruff a diamond low in dummy later.
Now ♣A
If you continue with a club ruff... down you go!
You have to cash the ♦A next because if you don't you won't be able to ruff your third diamond in dummy which exhausts North of their diamond exit card
If you have a double dummy analyzer you may find this hand to be a most interesting excursion.
Anytime I can see all four hands and still don't see the solution in a a minute of study
THAT'S A GREAT LEARNING EXPERIENCE
Benefits include:
Plus... it's free!