: ( 150)
White mistakenly continues with occupying Black's liberties.

:
This is the ko-threat that wins Black the game.

:
White erases one of Black's ko-threats ...

Ko: ;

:
... that come into play after White's centre group has been reduced to only three liberties with this move.

Had White played at , to erase Black's ko-threat on the left side, the atari of on the upper edge would have become a valid ko-threat for Black, instead.

:
Black wins the semeai by one move.