Tapir: After 1,2,3 the circled points are miai. One makes an eye in sente and a second at c later, the second cuts and capture. Nice problem. Looks very dead at first sight. But this doesn't work with at . Very sad.
Black has its first eye (circled point) and makes second one at c
fractic: Correct. I more or less stumbled on this during the game. In the game wasn't there so I could have lived more easily.
tapir: If I read correct in all sequences black may even tenuki at some point (after or respectively) and still get a ko.
fractic: Do you mean tenuki after resp ? Could you show what mean exactly?
tapir: Yes. In the first two sequences ko is where is played in the last one (main line?). In the main line simple double atari.
fractic: I see. I was just confused about when exactly you wanted to play tenuki.