East could win and give his partner a club ruff, but Greenberg had the rest.
South took his club ruff and should have led a trump.
There was no way to prevent West from scoring another club ruff.
Then a diamond to East's king would permit a club ruff.
Then he could maneuver two club ruffs and make his game.
East had missed another chance to give its partner a club ruff.
Now a club ruff brought down the king and the rest was easy.
If he played a heart, the club ruff would score.
This let East win with the queen and give his partner a club ruff.
East won with the king and gave his partner the essential club ruff to defeat the game.