unkx80: in this solution don't look right, because kills (leading to the position at the end of variation 1).
xela: The marked stones are captured: black is dead.
Edit: on second thoughts, no, at makes things more interesting, I'll need to think some more about this...
atulab (15k): it looks as if I can prove 2 a and b are wrong
here threatens life with , which white prevents by the atari at , but white still needs to get his stones out of danger and black has time to get another eye by playing 10
atulab: a little more 15K wisdom, this time aiming a the solution
white has the funny move a 1. white 2 being deadly, black plays here himself but is then squeezed and forced to play the ko at a note that black has a local ko threat at the squared points so there should be a better position (or my attempt is doomed ^^)