xela: This is ko? Edit: silly me, no ko, white a puts two stones into atari. I guess this counts as a failed attempt then :-/
fractic: unkx80 gave away the first move. It looks passive but it works. is the most tricky answer and I think
is the only move. After
Black can capture either
or
. If
is played one space to the right then Black can rescue
by just playing ataris.