Next he entered dummy with a trump lead and played another club.
Notice that West could have won the first trump lead with the jack and shifted to a club.
To a trump lead, players must always head the trick if they can.
That would permit an eventual trump lead toward the king.
South could not afford a second trump lead since the defense would play a third.
The defense had to be exactly right, starting with a trump lead, to allow West's heart eight to demonstrate its power and defeat the game.
After a trump lead, East would have won with the ace.
He came back to his hand with a trump lead, and was relieved to find an even split.
On the next trump lead, East played the jack and the ace won.
It was more of the same: a trump lead is lethal.