TsumegoFromGames167/Attempts

 

Dieter: I believe Black can kill and ...

 

Reuven: I expect this kind of sequence? (Maybe at ?) I don't think B can kill from here on, can she?

 

White can make a ko. Of course, White can play first and leave the ko as a threat.

10 at  

could really be at a to separate the top white stones instead of the failure line shown. I haven't found a way for white to save the top. at seems worse for black; I think white can save the top stones then.
could also be at b to try to save the corner stones; W is forced to capture and black plays c. This will end up in a ko; see next diagram.

After B b in previous diagram  

Something like this would result if B tried to save the corner stones with a ko, instead of settling for capturing the top white stones.