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Black tries to protect his potential territory in the top left corner with after the exchange of for in the lower left.
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White, however, has a surprising local response. First, she captures the nakade.
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Please note that connecting White's three stones at the lower left edge is sente for her.
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This enables her to push through ...
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... and to throw-in, also giving atari at some of Black's stones in the corner.
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White eventually gives atari at Black's four stones, leaving Black helpless. Please note the value of .
: and are miai.
If Black connects at , White gives atari with . After Black's connection at , White cannot approach from the right, but from the left with , so winning the semeai.