Black makes a comb formation, which is alive. Now a and b are miai.
After and
, it becomes obvious that a and b are miai.
After and
, it becomes obvious that a and b are miai.
Black seems a shapeful move, but actually it creates a bulky five. White
strikes at the vital point.
Black invites White to create a ko with
. Later ...
... when Black recaptures the ko, is an internal ko threat. Black must play
and White can recapture. Therefore, in the previous diagram
is better than a.
Black takes another seemingly vital point, but this diagram is rather a silly way to die.
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Problem 23
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