The virtue of the stone in Dia. 1 is easy to understand: it
denies Black access to the corner. If Black attacks, he will have
to build his position in the center or along one side of the board,
where it is harder to find security. The drawback of a play on the
three-three point is that, tucked so far back in the corner,
it does not give much help in developing into the center.
The two sections of this chapter will show what happens
when Black approaches the white stone in Dia. 1.