Bridge Quiz 26-4
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West
8 5
♥ K J 10
♦ A J 9 5
♣ A K 8 5
  East
K Q 9 2
♥ 6 4 3
♦ K 8 4 3 2
♣ Q

The suit with the least number of cards in Declarer and Dummy's hands combined is the ♣ suit.

♣ A K 8 5     opposite     Q ♣

Five (5) cards in total.
According to Blackwood's theory, you should therefore play for the drop of the Q♦ in this Deal.
Therefore play the K♦ first*, then the A♦ the next trick, in the hope that Opponents' Q♦ will fall under the second trick.
Is that the case here ??

*
Playing the K♦ first keeps the finesse holding (♦ A J 9) in West's hand in tact, useful if North does not follow suit in the first trick (showing a void in s).