North lead 2♦, declarer play low from dummy, you win with the K, declarer play 5 from his hand. You lead fourth best. Plan the defense:
a) 10♣ b) 4♦ c) 4♥ d) 4♠
Are You Shure You Got It?
Check The Answer Here
Solution: b) From the bidding we know that west has at least five spades. The partner didn’t lead a club, so maybe he has only three. It is very likely the west hand to be 5125. The best line is to cut their communications in diamonds, before unblocking the A♥ or knockout partner’s A♥.
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I think there is a typo. You said “before unblocking the A♠️ or knockout partner’s A♠️.” I believe you meant the A♥️!