: ( 68)
Black plays on the outside, trying his luck in the centre first.

: (39 70)
Please note that White is unable to stop Black's flight earlier, e.g. with .

:
There is no chance to escape on the lower edge either.

:
Latest now, with only three external liberties for his group, Black must return to the semeai in the corner, if he wants to win the semeai there.

He cannot afford to lose another external liberty, because the lower right corner would become seki, and his large group in the upper right cannot get more than only one eye.