One Thousand and One Life-and-Death Problems / Erratum 6

Page 183, problem 751, problem diagram

[Diagram]

1

Black to live


Page 183, problem 751, solution diagram

[Diagram]

2

Black plays 1, sacrificing two stones. After White captures with 4, Black 5 makes a second eye.


[Diagram]

3

Erratum: Black can just connect his stones at a or b since White cannot make a false eye on the left. This way he does not have to sacrifice two stones to live.


[Diagram]

1 erratum

jvt: A new kind of problem: which stone to add or remove so that the solution makes sense. The diagram would have to be like this for the solution in Diag. 2, sacrificing two stones, to work and be unique.


PatrickB: If Black plays a in diagram 3...

[Diagram]

White plays W1, making miai of a and b. Black is now dead. Similarly, if Black plays a in the original diagram, White just plays atari above his stone on the right and then connects at b. Again, Black is now dead.

[Diagram]

Still alive and well (1)

[Diagram]

Still alive and well (2)


PatrickB: Gah, you're right. Silly of me. I should have seen this. Is the proposed new diagram actually unique, though?


What if Black plays at B1 instead of sacrificing two stones here? Without a white stone in the corner at a causing shortage of libertis, Black can now play at B3, yielding:

[Diagram]

1 erratum



Leaving this, with a and b miai, Black alive, and again no unique solution requiring sacrificing two stones...

[Diagram]

1 erratum


[Diagram]

1 erratum

unkx80: Dead.


Gah again. This is what I get for wiki-ing at 3:30 AM. Pardon my stupidity.


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