In this case the play would have to be different if East held the diamond ace.

South led to his diamond ace and played a low heart.

West led the diamond ace and continued with the jack.

His first move was to win the diamond ace and lead the heart nine.

South held up her diamond ace for a round, and West continued with the king.

Or should he hope to find his partner with the diamond ace?

He won with the diamond ace and led the heart jack.

What is your plan after winning with the diamond ace?

The first key play is for East to cash the diamond ace.

He received some help when West led the diamond ace and continued with the six.