This problem assumes that the reader knows how a ko fight works.
This shape looks like the twisted four, but it is at the corner. We note that when the group has only one outside liberty at , Black can turn the status of this group into a ko. This is similar to bent four in the corner.
occupies one of the middle points in the twisted four. When
occupies the other middle point,
takes the ko first. The answer is "Ko for life, Black taking first".
attempts to set up a oshitsubushi, but this leaves the White group with only one liberty, so
simply captures all the White stones.