Completely Artificial Problem / Discussion

lavalyn takes on ANY tsumego regardless of difficulty

[Diagram]

The vital point

lavalyn: I am thoroughly convinced this is the first move of the killing sequences. While my depth and calculation do start failing at around move 12, this is the one I can't refute.

[Diagram]

White dies 1

[Diagram]

White dies 2

[Diagram]

White dies 3

[Diagram]

White dies 4


MattNoonan: I don't see an obvious refutation to this sequence:

[Diagram]

White doesn't die 1

I don't see any way for Black to continue except for a, but then:-

[Diagram]

White doesn't die 2

..but now Black can't play a without b, so White lives.

So a in "White doesn't die 2" seems like a vital point of the shape. What if Black takes it?

[Diagram]

White doesn't die 3.a

[Diagram]

White doesn't die 3.b

[Diagram]

White doesn't die 3.c

..and White gets a ko.


unkx80: Whoa... I thought I solved the problem last night, but actually I did not. Now I *think* I see the solution, so it's a double under the stones problem?


[Diagram]

Hmmm... ko ?

What about this ? --Nando


Lucky

Yes, this is the answer Nando.

Yes, it's a double under the stones problem unkx80.

MattNoonan got the correct sequence but was three moves away from the right answer.

Quite difficult to read it in your head, no? :-)

Nando: definitely ! ;) Thanx Lucky for providing it here :)

unkx80: Thanks for such a nice problem!

MattNoonan: So close! Great problem :)


[Diagram]

The vital point

IwaHanako?: How about B1 as a first move?

[Diagram]

The vital point

unkx80: This lives.


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