Gokyo Shumyo, Section 1, Problem 46 / Failure

Authors: Dieter, unkx80

This is a failure diagram from Gokyo Shumyo, Section 1, Problem 46.


I would like to ask, why doesn't Black simply play at B2 instead? Seems dead to me, but now it is 1 am Singapore time, and I might be wrong...


I don't know why I missed this one. At the time I started this page, I was or should have been clearly awake #:-7



Now, how about the strongest responses for both?

Approach ko  

This results in an approach ko. If B10 fills a liberty at a, then White at B10 makes seki.

What happens if Black plays B4 at W5 in this diagram ?

Better for Black?  

This is another approach ko, but now Black takes first, and his loss is smaller if he loses the ko, so this is probably better. (please correct, unkx80, my previous contribution was terrible).

Less strong play  

If W6 here, then Black can cause an almost fill with a farmer's hat at the marked points and White is dead.

White lives  

However, White plays diagonal attachment at W2 and Black has to play B3 to prevent two eyes. Now White throws in at W4 ...

White lives  

... and she has enough outside liberties to fill in the inside liberty, putting Black in oshitsubushi.

Gokyo Shumyo, Section 1, Problem 46 / Failure last edited by Unkx80 on March 21, 2005 - 15:23
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