guile: I will add Lyde seq and update the SGF, I think that it makes a lot of sense with the comments below. The Tsumego is in the state "Work In Progress" for now.
guile: @heron, i did not understand the seq you pointed at first, sorry. I added a crawling seq to show it is not an option to crawl hoping for life and that accepting the Ko is not good for the attacker. Feel free to add more comments or ask further questions.
guile: Master Lyde showed that Ko is avoidable anyway and therefore that the direct kill should be the correct solution. The Tsumego is updated.
heron: When defender responds to F17 with F18 instead of E16 the continuation seems much more difficult to me
TwT: Dear Heron,
I completely agree with you. When the defender responds to O17 with O18 instead of P16, the continuation indeed becomes significantly more challenging. Given the approximate 5-kyu difficulty, a KO fight adds an escape option that complicates the situation further.
My initial thoughts were to (a) add a stone to simplify the complexity, (b) mark O17 as incorrect, or (c) if you prefer to keep it, to ask you to work through the following sequence in detail providing us a SGF or as a proposal. What are your thoughts on this approach?
Master Lyde seq have been added.