(Referenced by 1043)

Black might even have played his last move (in exchange for White filling-in her second false eye ) at , and occupied a shared liberty, instead of an external one. We already removed these two stones for analysis purposes.

Ko: ; @

:
Black should play his external ko-threat (needed for win) just now.

Ko: ;

:
Black is unable to further occupy White's liberties, so he must connect the hanezeki's tail.

Ko:

:
As usual with one external ko-threat for Black, Black wins the ko-fight.

This means that Black must think twice before occupying the very last external liberty of White's centre group.