TherapieGo: [current position] + B19 White is Alive here. C18 Black doesn't work because (see my message above). Only F19 work after B18 ; A17. Maybe need a "What about this answer" for ad A18 after B18.
Hrewsahgs: [current position] S19T18P19R19N19O17M18 seems like a possible resistance if the attacker insists on a non-ko variation, so a clean kill might not be possible.
Ivan Detkov: This is ko, no a clean kill. S1 meets R1.
I made this variant incorrect.