Gábor Macskásy played 3N in this board. He took the spade lead with the jack and played the king of diamonds. When his opponents ducked this, he switched to hearts and East won with the king. After taking the jack of clubs return in his hand with the ace, he led a diamond to the queen and played another small heart.
East won and insisted on clubs. Declarer played the king and cashed the queen of hearts, and now double dummy it seemed he will only have 3 heart tricks and has to lose 3 clubs at the end, having no entry to the high spades. But on the queen of hearts his opponent didn’t see Macskásy’s sad fate yet, and he made the mistake of not unblocking his ten of hearts, so declarer endplayed him leading his nine of hearts.