South	West	North	East
1NT	Pass	Pass	Pass

South opened a strong notrump and everyone passed.  West led the diamond two, North displayed a fairly typical dummy, saying that he had full confidence in partner's ability to make this contract.

South is desperate to reach dummy to take the spade finesse in the hope of making five tricks in that suit.
If West has led from the ace and East plays the queen then an entry to dummy can be forced by winning the king and playing a diamond back.  If West has led from the queen, then South can unblock the king underneath the ace and then lead towards the jack.  East may foil that plan by ducking with Axx, so South must play the nine from dummy and hope that West has the ten.  Of course West may have led from 10xxx, so you may guess wrongly.  Also East could well find the club switch in which case you are in trouble.