Against 3NT, East leads the 4th best spade. How should E/W defend?
(Assume that declarer finesses in diamonds, losing to West’s ♦Q.)
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Gino's suggestion and a Short Explanation
West wins the ♠K. West continues with another spade. East must duck the second trick (refuse to play the ♠A). East who holds the length in spades lacks a side entry. Ducking an early round of spades allow the defense the transportation needed to cash 4 spades.