Source: 
Problem diagram.
White plays.
Jim's Journal James Kerwin 1p
Solution follows
(or click here to download SGF)
Too deep.
Clearly White must do something about Black's large framework in the
upper right. However, White 1 has the shortcoming of not holding
future promise for attacking weak Black stones. In addition, the move
will swell Black's adjacent territories as the invading stone only
becomes a burden to White.
More promising.
The White invasion at 1 is more promising.
White not only won't have much trouble living,
but also will have a chance to harass Black's right side group.
Black can try to pincer the invading stone with 2, but
White can quickly run out through 5, and Black's stones are
now attackable.
Black variation.
Black can also try to press White from 2.
However, through 5, White has room to settle deeper
into Black's former sphere of influence.
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