North leads the ♠3. The ♠6 is played from Dummy, South plays the ♠K, which is captured by Declarer's ♠A.
How many sure winners can Declarer count ?
Which cards must Declarer play in his and in Dummy's hand at trick 2 ?

A sure winner is a trick you can win immediately without losing a trick (for example to an Enemy Ace) first.