Gokyo Shumyo, Section 1, Problem 47 / Solution
Black sacrifices two stones, hoping to destroy the eye by giving atari with at .
White makes the surprising move at , allowing Black to capture four stones!
In the space created by the four captured stones, White can recapture two stones.
Obviously, White mustn't answer at here.
If White hastily answers the atari by (temporarily) saving her stones with , kills.
If White fails to make the four-stone sacrifice, and connects at here, then takes three stones, and there is not enough room to play "underneath".
makes one eye in the corner. makes miai of a and b to take away the other eye.
here would allow White to live in ko.
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