Confused: It looks to me, that White needs to give atari to the marked black stone, otherwise Black will take one of the two remaining liberties of the white group at the top or take the single white stone.
If white gives atari with , the best I came up with is to set up a ko in the corner with
. White needs to win this ko twice in order to kill the black group.
Is there a better solution?
AlainWettach : This is the correct way of playing.
For reference, here is the snap-back which should be considered