TwT: Resubmission of obvious for further discussion
Ivan Detkov: I changed taking the ko to the cut. There is nothing wrong in taking the ko but it seems like a rule here that if there is a straight life move, taking the ko is an error.
semelis: Either starting with the cut at K18 is wrong or cutting there without taking the ko at F19 is right. Or I'm missing something.
TwT: If you are referring to the lower correct solution, I would say that if we haven't overlooked anything, then it is incorrect. Vulgo: True Masters please have a look. Otherwise I will do a cut first take second correction.
I changed taking the ko to the cut. There is nothing wrong in taking the ko but it seems like a rule here that if there is a straight life move, taking the ko is an error.