When he took the ace, South was in full control.

Taking the ace at once would not have helped the defense.

He then led the heart king and West took his ace.

West took the ace and led another club to South's king.

West took the ace and led a club, giving South a difficult decision.

West led the heart jack and East took the ace.

South led another club, and West made life easy by taking his ace.

South next led a club, and West took his ace.

East took the ace and returned a club, won with the king.

West took the ace and continued with a second club.