fractic: White can obviously live and kill black. So let's see what Black can do. is a nice tesuji threatening to play at a. is the simplest responce allowing Black sweet life in gote.
fractic: here offers more resistance. can't be at because then would kill. After both groups only have one eye and White is in atari.
fractic: After - black must throw in at to get a seki. If at the Black makes a seki in a similar fashion.
unkx80: For the intent of the problem you get full marks. However, I think there should be a better way of making seki.
Dieter You mean this?