If White secures the eye in the corner first, Black ataris twice to prevent the second eye. at doesn't work either, because of snapback.
If White captures first, removes the second eye in the centre, also threatening to take away the first central eye. Now a and b are miai for the kill.
If White secures the central eye with (she cannot play at a due to shortage of liberties), Black removes the corner eye directly.
does not work. After , a and c are miai for life.