Under The Stones Problem 7 / Solution

Solution

[Diagram]

Black is (almost) alive (?)

After B1, there seem to be several continuations; in the most direct, W2 and W4 capture five black stones...

[Diagram]

Black is alive in a simple way

unkx80: The B3 in the above diagram is dubious. B3 here is very simple and direct. Then a and b are miai.

Well, excuse me! You are right, of course. My B3 doesn't work because leads to ko (and costs Black four extra stones)!

[Diagram]

Continuation (of first diagram)

After B1, if White captures Black's square with W6 and W8, B9 forms two eyes. Note that White cannot subsequently play at a!

[Diagram]

Continuation problem

unkx80: Although White cannot play at a, there is also the move at W1 to consider. I leave it to you to figure what is the result.

OK! Black's shortage of liberties comes into play, and Black must play at A, resulting in a ko fight!

Black can also take White's stone, or play at B, but the ko can't be avoided.

unkx80: No... Black still can live unconditionally. Refer to some of the other solution diagrams to figure out how.

[Diagram]

10 at 7, 4 at 1

[Diagram]

1 Kills. I referred to another solution :P

Kuolema: I can't see how can black live unconditionally, any way I look at it, it leads to a ko. (Unless black wants to kill himself)

unkx80: Eh... my mistake. Sorry. =P




[Diagram]

Black is alive ?????



[Diagram]

Black is alive ?????

W10 @ BC, killing.


[Diagram]

Black is alive



[Diagram]

Black is alive



[Diagram]

Black is alive

B3 @ WC, living.



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