If that was required, East would play a low heart.

But when he played a second heart, West won and led a third round.

But in practice he would play hearts and find the truth too late.

He played a second heart, and South was now able to bring her backup plan into action.

The jack lost to the king, and West made a mistake by playing a third heart instead of a club.

He played a heart and permitted East to win three times.

South won with the ace and played a heart to the king.

Then they eased the limits on when you could play a heart.

East now had a small accident: he played a heart in error.

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