: ( 297)
Black gives atari from below. However, this aggressive measure will not pay off for him.

: (92 300)
White's atari here is absolute sente.

For other variations, it will be important that White - quite surprisingly - could capture at instead, which we discovered only very late in 2014.

:
Black is unable to create a false eye.

:
White lives by capturing some Black stones. She might have played simply at , instead, to get her second eye.

Please note that we do not think any longer that White's fate depends on the possibility of her atari at (=). It seems to us that White is able to start the forcing exchange in the top left corner - beginning with , - even before the shape on the upper edge has become fixed.