After such defense, the contract would probably have failed by at least five tricks, for a penalty of 1,400.
But the king was not played and the contract failed.
Now South had no way to collect a 10th trick and the contract failed.
In addition, the contract failed by eight tricks, not seven.
At other tables, the same contract frequently failed, when South lost control.
That contract was not a happy one, and would have failed after any lead.
Even if they do begin trading, such contracts could fail for lack of interest.
If the contract failed the opponents might have missed a heart game.
Nevertheless, the contract failed and would have made if another suit had been led.
That contract would probably have failed by two tricks, for a penalty of 300.