South won with the queen and tried a club to the king.

He returned a club, and South won with the queen.

East won with the queen, and led a low club.

She led a heart, on which West had to play low, and won with the queen.

A heart was returned, and South won with the queen.

She won with the queen and led the club king.

He then led a heart, and won with the queen when East, in his turn, played low.

It was then safe to return a heart, and West won with the queen.

South would have won with the queen and followed a similar path.

South allowed East to win with the queen and was in control.