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KanazawaProblem88

 

Kanazawa Attempts 88
    Keywords: Problem

I have not seen this problem before, so here's my take.

[Diagram]
Diag.: Attempt

[Diagram]
Diag.: Variation 1

[Diagram]
Diag.: Variation 2

[Diagram]
Diag.: What if ...

Continued at [1].

Dieter

Hmm... I failed to notice this one. I will try again some other time. =)



DaveSigaty: Based on the above...

[Diagram]
Diag.: Another attempt

[Diagram]
Diag.: Timing?

Does waiting until this point to play White 5 make miai of the left and the right? White 6 (the key point in the previous try) no longer seems to work.


[Diagram]
Diag.: 6 at

Oops! Black 5 recaptures and ends the threat on the right while keeping the marked white stone in damezumari.


[Diagram]
Diag.: Ko

So White has to play 7 here and Black makes ko with 8. Note that a can be used as an internal ko threat.



dnerra: It seems to me your last diagram does not work, Dave:

[Diagram]
Diag.: No need to defend everything.

One eye for White.


[Diagram]
Diag.: Another attempt

Q: Why not start with the key point White 1 here?

A: Because Black plays 2.



[1] unkx80: From the third diagram by Dieter and Dave's suggestion, how about...

[Diagram]
Diag.: What if...

Dave: This looks about right for the play at 2. As dnerra shows above, this move by itself is not enough to live. The timing must be right, when Black is fully committed on the left. Let's see what the official solution is. Does White have something better? Even if she does, this has been an interesting analysis :-)

Dieter: This is the main line as given by Hashimoto Utaro. I'm a bit puzzled why all of a sudden the solution is a ko. There is definitely a ko section later in the book. Well it is a good thing, for now we can't even be sure anymore of the kind of solution we're looking for in the next problems.



dnerra: I was sure to have found the solution before I found the above diagram:

[Diagram]
Diag.: Yet another line.

White 3 at the square-marked stone, Black 4 at the circled stone.

But it's indisputable that the ko in unkx80's solution is better. What an intriguing problem!

unkx80: I am not sure this is yet another line. What if Black 6 plays at 7 instead?



This is a copy of the living page "Kanazawa Attempts 88" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.