: ( 303)
Black plays atari from below.

:
White's atari is absolute sente.

:
White captures Black's single stone.

:
Black is unable prevent two eyes for White's group. White wins the game with ease.
Please note that White's fate depends on the possibility of her atari at . If Black's eye taking move has been played already, White must not start the forcing exchange in the top left corner - beginning with , - before the shape on the upper edge has become fixed.