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White does not have any ko threats against Black's top left corner, so she has to start the ko fight "early", to exhaust Black's ko threats.
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The time is ripe to connect the hanezeki's tail.
Ko: ; ;
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White erases Black's last essential ko threat (the atari at ).
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White's final ko capture leaves Black helpless, as there is no Black ko threat left. After any Black move, White will connect the ko.
Black is unable to give atari at , while – in principle – White could take Black's connected tail group off the board, starting with a move at .
128a
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, while – in principle – White could take Black's connected tail group off the board, starting with a move at 
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