unkx80: This problem was never attempted since it was posted in August 2005. It seems to me that Black is unconditionally alive, no? Dieter: will investigate.
Black has enough liberties to throw in and denies the intruders to make bent four in the corner and ko.
Reuven: I think it's alive like this as well, such a lively form :) But here almost any addition of a white stone and some of b stones make it killable... Would you like to change the original problem into a solvable one?