Tapir: After White's only choice not to end up similar to the first diagram (lacking liberties to approach, the black eyed group) is the ko. Black takes first.
hhw: Wouldn't this revert back to the first diagram?
tapir: Indeed. Why I always make up non-working sequences. :(
hhw: This seems pretty convoluted, but looks like it works. Result is ko.
tapir: Seems to work. -
are not needed imo,
at
directly, or
at a is easier to see, and still the same ko.