Main line: Hashimoto Utaro
Variations: Dieter
Black starts at the 1-2 point. Usually, White keeps this shape to one eye, but here there is aji in . The key move is
. After
, Black can either capture four stones in shortage of liberties at a, or make two eyes at b.
Because of the presence of ,
doesn't work.
and
are miai, and so are a and b.
If here, White destroys his eye with
.
Now and
are miai to take the eye away.
here is not sufficiently forcing on White's four stones. White takes the time to create a killing shape with
. (unkx80 has written specifically about this shape at rectangular six in the corner.)
Go to Problem 70
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