Joseki-related life-and-death example 9

White to play  

White's to play. Both should keep the J-group in mind when playing here.

Success  

turns the corner status into ko. See J-group for more detail.

Variation  

If makes a diagonal move, then to is a standard killing sequence.

Variation  

This seems to work at first glance, but this makes short work of it up to the throw-in at . (Playing at or are two other ways that White can kill Black, after - the variations are left as an exercise!)

Failure  

White is first to take this ko but loses a lot when she loses the ko.