Gokyo Shumyo, Section 1, Problem 100 / Attempts

[Diagram]

White to live

This problem has me completely stumped. Fortunately I needn't feel bad about it because I'm not nearly strong enough to be supposed to solve it.

This is the best I can do. If for some reason black responds to W3 at B4, then white can live with the sequence W5-W9. After W9, white threatens to capture the corner, and if black defends it by capturing W5 for example, then white a makes life at b or c. Black will of course not answer W3 at B4, but maybe there is some aji with the marked stones to make black answer W3 at B4.

--Stickleback


[Diagram]

White to live

Maybe this is the answer. After W9, black has a problem. White can play at a to get an eye at b (or capture black), or at c to capture either black B4 or black B6.

--Stickleback

[Diagram]

If black defends on the left

After W9 white threatens a capture on the left and a ladder on the right.

Does anyone see a refutation? (maybe B2 at a?)

--Stickleback


[Diagram]

tighter defence by black

[Diagram]

White continues the forced sequence.

Seems to work for white.

--Medice?

[Diagram]

If black ataris from this side..

[Diagram]

Black gets caught in net. ignoring 5 does not lead to ko as white will force eye at 'a'

Seems like a solved problem to me.

-- Medice?


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