: ( 140)
Black forces White to occupy a liberty of her group with a move at . White cannot answer at , instead, because Black's answer at would leave her centre group eyeless, and with a third false eye.
:
However, Black's group also lost a liberty, so White again is able to play another protective move on the left side, pre-empting all of Black's potential ko-threats there.
Ko: ; ; ;
:
Black should refrain from using his ko-threat of , in the hanezeki. As we have seen in the previous sub-variation ( 160), Black would lose another move by this procedure.
:
Black has no valid ko-threats any more.
:
White connects the ko.
:
It seems best to connect the hanezeki's tail now.
:
Black is unable to give atari at , so White wins the semeai by one move. Here, the sequence is even shorter than before, so initially forcing White to occupy a shared liberty was no good idea at all.