GokyoShumyoSection1Problem103/Attempts

[Diagram]

Gokyo Shumyo, Section 1, Problem 103

Whati if W E19?

[Diagram]

Gokyo Shumyo, Section 1, Problem 103

pwaldron: Then it looks like black is fine. If White throws in at B4 instead, black connects at W3.


[Diagram]

Gokyo Shumyo, Section 1, Problem 103

pwaldron: The best I have found so far is this. (B4 connects)

[Diagram]

Gokyo Shumyo, Section 1, Problem 103

pwaldron: Now white must fight a ko in the corner in order to capture the two crucial stones.


bucko: How about this third move? It creates a shortage of liberties in the TL corner.

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Throw-in then clamp.

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Now, because W can cut at the marked point, B does not have enough liberties to kill W's stones before W kills the cutting stones.

xela: black 'a' next makes a ko?

[Diagram]

If B just descends, W descends too, then sacrifices two stones to make a dead eye shape.

[Diagram]

Now W can cut and kill the whole corner in a simple liberty race.

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If black plays the hane, he is unable to cut after white descends.



unkx80: Very interesting! But...

[Diagram]

Throw-in then clamp.

I think B4 kills.

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Throw-in then clamp.

With B8, Black group is alive with two eyes.

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Throw-in then clamp.

And then White dies from the straight three dead shape.


bucko: Perhaps this is simply a problem of move ordering. It is rather simpler, but less obvious(?), but perhaps W can just descend:

[Diagram]

Similar to before, but less B can do: Clearly B must now cut, so the sequence goes like so.

[Diagram]

And we are back to the variation that worked. :)

a and b are miai.


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