GokyoShumyoSection3Problem40/Attempts

[Diagram]

Black to make ko

LukeNine45: Perhaps this?

xela: No, W6 at 'a' and there is no ko. Unfortunately though I don't know what the correct answer is! I want to play B1 at W2, 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:

[Diagram]

W8 at W4

xela: I don't think this works either: W4 at W6?

LukeNine45: You mean this? Still ko, no?

[Diagram]

ko?

xela: Yes, ko.

[Diagram]

This way of avoiding it doesn't work.

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white is trapped

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

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continuation

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Another idea

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

[Diagram]

variation 1: ko

Maybe W2 is wrong: can white live if B3 is at 'a'?

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variation 2: another ko

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

[Diagram]

variation 3: white dies

If W4 at B5, the result is similar to variation 4 below.

[Diagram]

variation 4: complicated!

This is the part that I (xela) find difficult. B1 can't escape, but white has a dead shape. (If W4 at 'a' instead, then B5 at W4.) I'm sure there are a few more variations, so I may have made a mistake.

LukeNine45: W4 at b? hmmm, no then B5 at W4...

[Diagram]

Variation 5

LukeNine45: I think white lives this way?

xela: If black plays B3 at 'a', then the eye at 'b' can be squeezed shut, same as in variation 4 above?

[Diagram]

Variation 5.1

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Variation 5.2

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Variation 5.3

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


xela: ... so now we seem to have two solutions!


modified; 10 at 4, advantage white!

[Diagram]

This seems to be forced all the way


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