RTG Problem 33 / Attempts

ko?  

Gronk: Here's an indirect ko.

without ko?  

Stormer: What about this. if white a, then B, if B then C

without ko?  

unkx80: Don't think this works. After , if a then b; and if c then d.

main line?  

Tasky: I think this should work, but I don't know if it's enough

White resists No.2  

Ko, white takes first with a lokal threat on a; same thing if 2 and 4 in different order. If 4 at -> Ko, with black taking first
If w play's any other move, b captures on

White resists No.3  

White take's the Ko first on a if he play's like this but he doesn't have the threat on - anymore