Contract is 3NT by South
Lead 
K
With the spades wide open, you have to find the diamonds breaking
2-2 to make your contract. . (A 3-3 club break gives you only eight
tricks.) However, you must look closely at those diamond spots. What
are you going to do?
Scroll below to see.
After cashing the 
A,
you had better lead the 9
to dummy’s king. When you get the favorable 2-2 split, you can
win the third diamond trick with dummy’s seven over your six.
Then the other three diamond winners in the dummy can be cashed.
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