This deal is from an online EBU duplicate.
After a straightforward auction to three notrump West led the four of hearts which went to queen and ace.
Declarer now started to develop the spades for extra tricks while trying to stop East, the danger hand, from gaining the lead.
A spade went to the jack and king and then a spade to the nine held with West discarding a club. Nine tricks are guaranteed now, but overtricks are useful at matchpoints. If East has the club ace and West's hearts are headed by the king and ten, accurate defence should hold declarer to nine tricks.
Declarer cashed the ace of diamonds and played the queen overtaking with the king to take another spade finesse, and then cashed the spade ace, West discarding diamonds. Two more rounds of diamonds were played with West discarding a heart and a club, East two hearts.
The position now was as below
Now playing either suit from dummy endplays West to give declarer ten tricks, which was worth a surprising 96%.