: ( 437)
Mistakenly, Black gives atari on White's five stones.

:
White reduces Black's large group to one eye.

: (A 455; B 456; C 457)
Black captures here. He will not succeed either, should he play at , , or , instead.

:
White pre-empts Black's sente at this point. And makes the fate of Black's top right group independent from the fate of her group on the left edge, which is too small, even if it died.

:
Black cannot prevent that White lives on the upper edge.

:
Neither can Black prevent that White lives with her group on the lower edge. Now, White owns more than half of the board.