xela: I think this is the key point, but there are many variations...
xela: This is the first thing I saw. Does white have a better way to resist?
xela: This is the same shape as problem 2. (Black has an extra liberty, but the same sequence still works?)
xela: If white tries , this is where I get confused. I think and still threaten to capture the marked stones, so black can still get ko this way.
xela: looks tricky, but black can live unconditionally?
unkx80: The first thing you saw might not be correct?
xela: It wouldn't be the first time such a thing has happened :-) Thanks again for the feedback, I am certainly learning a lot from attempting these problems. I hope it is at least entertaining for the audience!
Black has tesuji:
I think (1) is the move