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2006-10-16
Problem diagram.
Black plays.
Source:
Go World #37, Autumn 1984, p. 6
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Nihon Ki-in
Solution follows
(or click here to download SGF)
Best.
Black 1 aims toward a moyo in the upper right,
and attacks the two White stones on the right side.
Through Black 3 is one natural sequence.
Inferior.
Black 1 is in the correct direction, but doesn't
go far enough. White would then probably defend
the corner with 2. Now a Black play at 3 would
not be as forceful, because Black 1 is not in the
ideal position for creating a moyo in the upper
right.
Slack.
Locally Black 1 (or A) is excellent. However,
White is happy to extend up the right side with 2.
Now the White right side group is much
stronger, which weakens the Black positions
at the top and bottom. White gains more
than Black gains in the lower left corner.
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