Again, the lead was the diamond king, and South had to win.

Everyone knew what had happened and West made the routine lead of the diamond king.

Now South had to guess the location of the diamond king.

When the diamond king was led, he knew five more.

The diamond king walked into the study and closed the door.

He then led the diamond king, and was on safe ground.

It would not have helped West to return a heart after taking the diamond king.

In the actual position, West would win the diamond king and play a club.

It also increased the chance that East held the diamond king.

West led the diamond king and made the key shift to a heart.