Gokyo Shumyo, Section 2, Problem 5 / Attempts


xela: I think this does the trick.


xela: W1 is a mistake. After B2 and W3, black can live with either 'a' or 'b'.

Food for thought  

unkx80: I have not seen the solution yet, but here's some food for thought. What if B4 is sente in the sense that it threatens to escape to the side? Then if White avoids ko, Black can live. (If W9 at B10, then B10 at W9.)

How about W3 at W9?

W5 can play at W9. This should solve the sente probem and keep it dead.


jms: If W9 at B10 (from the previous diagram), the result is Seki - black can make Seki at any time by playing at A. If Black mistakenly plays at B, however, Black dies.

Let's try again  

Gokyo Shumyo, Section 2, Problem 5 / Attempts last edited by on January 24, 2013 - 08:36
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