GokyoShumyoSection3Problem40/Attempts

Black to make ko  

LukeNine45: Perhaps this?

xela: No, at 'a' and there is no ko. Unfortunately though I don't know what the correct answer is! I want to play at , but I can't see a followup that works.

LukeNine45: Duh. Good point. I wanted to start that way too, but also didn't see a continuation! hmmm, how about this:

at  

xela: I don't think this works either: at ?

white is trapped  

xela: white can try to break out this way, but I don't think it works.

Another idea  

xela: I think this does the job, but there are quite a few variations...

variation 1: ko  

Maybe is wrong: can white live if is at 'a'?

variation 2: another ko  

This way is not so good for white, as black gets to take the ko first.

variation 3: white dies  

If at , the result is similar to variation 4 below.

variation 4: complicated!  

This is the part that I (xela) find difficult. can't escape, but white has a dead shape. (If at 'a' instead, then at .) I'm sure there are a few more variations, so I may have made a mistake.

LukeNine45: at b? hmmm, no then at ...

Variation 5  

LukeNine45: I think white lives this way?

xela: If black plays at 'a', then the eye at 'b' can be squeezed shut, same as in variation 4 above?

Variation 5.3  

LukeNine45: hmmm this looks both bad and unavoidable...