: ( 179)
White pre-empts Black's eye on the right edge.

:
But she will be unable to prevent Black's second eye on the upper edge. If she insists to do so, ...

:
... she will suffer from a shortage of liberties eventually, and her corner group will die. It should now be evident why there is that single, lonesome, -stone on the first line.

We will continue with part II of the "Variations of Our Solution" ( 199).