TherapieGo: The sequence A17 -> A18 -> C19 -> E18 -> E19 -> B15 is wrong because after B15 Black just needs to play B19 and it kills the group.
So instead of B15 you have to play D19.
caranthir: I don't see defender making two eyes in this way either. AFter D19, attacker takes. Now B19 and A16/B15 are miai.
Resolved.