Ko: ; ; ; ; ; ; ; ; ;

: ( 140)
White begins the ko-fight, without having played a protective move on the left side.

Ko: ; ; ; ; ;

: (A 151)
However, some kind of protective move will be played later. This move pre-empts the usage of the atari of as a ko-threat, and is sufficient to win.

White will lose, is she tries to wait with playing a protective move after Black's connection of the hanezeki's tail.

:
Black has no ko-threats left, and so must connect the hanezeki's tail at a moment, when White's centre group still has five liberties left.

:
As usual with this condition, White wins the semeai by one move.

White could have done better technically with playing the protective move (= ) much earlier, and on the left side, erasing more than one of Black's potential ko-threats there.