Declarer ♠AQx Dummy ♠10
All other suits either eliminated or dummy holds the tops. Its in hand and declarer needs two more tricks and hasn't been paying attention to defender's play so how it could it possibly lose to play the ♠x. At the table they either gave up or assuming the remote chance of a singleton K♠ and so lead A♠.
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Interesting combination 3NT 2 tricks from the last three cards
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