leaves white no way to link up or make a second eye in the corner.
If white tries to link up with , she is caught in a connect-and-die.
If white tries to capture , then the atari at
prevents the first line connection in sente, so
can capture the two white stones and kill the group.
If white tries to capture the other two stones with ,
is atari so
has to capture, and
removes the second eye.
Note: If at a, white dies in gote.
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