The position was now this, with South needing four more tricks.
The club queen could be a seventh, but he needed two tricks.
We need four tricks, and we shall assume that the suit does not split 5-0.
With the lead in dummy, South needed two more tricks.
He needed two additional tricks from one of the minor suits.
West won and had the lead in this position: South needs five more tricks, and it appears that the contract is safe.
The defense was apparently in control at this point, needing two more tricks.
But Zia needed only 10 tricks, and suspected from the bidding that the club king was on his right.
That left this end position: South, needing three more tricks, ran dummy's club nine.
The lead was in dummy and he needed five more tricks.