"Then your partner will eventually win a diamond trick and lead a club."
How would you have planned the defense after your partner led the spade ace?
He is defending four spades, and his partner leads a top heart.
He chose to pass, and his partner led the heart king.
Her partner took his ace and led the diamond three.
To lead back, usually the suit that partner led.
His partner would have won and led a second trump.
East was nervous when his partner led a trump, but the slam had to fail.
West had no reason to know that his partner held the spade ace and led the club ten.
His partner passed for penalties and led the spade seven.