[Welcome to Sensei's Library!]

StartingPoints
ReferenceSection
About


Referenced by
CarpenterSSquare
BigQuestionMark

 

BQM61
    Keywords: Life & Death, Question

I received the following question about the carpenter's square and forward it to SL while I'm thinking about it myself.

[Diagram]
Carpenter's square

White 1 is said to be incorrect because it allows Black to live in seki.


[Diagram]
The basic position

After this position two variations arise: a and b.


[Diagram]
Seki

After 2, Black's seven-space big eye space is of living kind. White can't make an eye in it, and neither can she almost fill with a killing shape. So far so good.


[Diagram]
Life (?)

The second variation as given in the book of my correspondent is this one.

jsha: Isn't 7 suicide? Dieter: Yes, I think 5 and 7 must be inverted. I'll WME this page soon. Bill: 5 and 7 corrected.


[Diagram]
Life (?)

Now, Black throws in and then the book says something like White must connect at a and Black captures at b: White can't play c because of shortage of liberties. So Black lives. However, ...


[Diagram]
Death !

White simply captures a stone, letting Black cut her stones. Next, she fills a Black liberty. Black is dead.



Dieter

... But I think I found it already.

[Diagram]
Life !

Yes. This is a position that is often given as a life-and-death problem, and 1 is the correct answer. --TimHunt



This is a copy of the living page "BQM61" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.