After such defense, the contract would probably have failed by at least five tricks, for a penalty of 1,400.
The contract could not now be made, and failed by two tricks.
South could make no use of the heart suit and failed by two tricks.
This failed by four tricks, for a penalty of 800.
In addition, the contract failed by eight tricks, not seven.
Whatever route he chose, South had to fail by two tricks.
This happened to cut South's communications, and he had to fail by two tricks.
First, it was likely to be a good save against four hearts, and would have failed by two tricks.
A save in seven hearts would have failed by three tricks, for a penalty of 800.
That contract would probably have failed by two tricks, for a penalty of 300.