: ( 145)
Black sets his hopes on a ko in the upper left corner.
Ko: ; ;
:
Valid ko-threats are left only in the hanezeki. Black can use these as a kind of desperate measure.
Seeking life for his large group in the top right corner, instead, is not large enough, because White does not need to capture the hanezeki's tail any more after finishing the ko on the left side.
:
Black recaptures the ko on the left side, but still will be unable to save his stones
:
White gives atari with this move, and Black is unable to connect at (White will capture with ).