Problem Nr. 344 from Cho's intermediate Problems
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tetron
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Re: Problem Nr. 344 from Cho's intermediate Problems
I was relieved when someone suggested the shown 2 as my first instinct was that black still didn't have two eyes.Bill Spight wrote:This is an ancient problem. In ancient problems escape was a factor. Modern compositions tend to be self contained. Different conventions, I suppose, the ancient convention being that the unshown part of the board is empty, the modern convention being that the unshown part of the board is unknown.cyclops wrote:Always trying to refute the expert solution I thought I found the refutation. But, of course, it fails. W's containment is too weak. B easily walks out at a. The problem depends on W being weak around there. Correct?
Assuming the rest of the board is unknown the white stones still haven't got two eyes either... I had been expecting a cleaner solution but I think that it is a more solution than you often see in modern problems.
I haven't played go for a very long time (if you don't count a computer program that was described on one website as the strongest free program but so many weaknesses didn't have a live stone.) and I am not sure that I would have expected the line to run to 'a'.
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Marcus
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Re: Problem Nr. 344 from Cho's intermediate Problems
It's just my way of saying "I'm too lazy to figure out why this doesn't work", but I liked the variations I spotted, and couldn't immediately see a refutation. Silly me, I should have known there would be one ... I still haven't taken the time to look at it yet ... and, I just found it, I think, while typing this:jts wrote:Marcus wrote: I leave continuations and alternate variations to the viewer.
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cyclops
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Re: Problem Nr. 344 from Cho's intermediate Problems
jts wrote:
here a sgf of the ancient solution from Herman's link:HermanHiddema wrote:@jts: That's not a modern problem!......
http://senseis.xmp.net/?XuanxuanQijingProblem35
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Chew Terr
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Re: Problem Nr. 344 from Cho's intermediate Problems
...I'll tell you, that's not the solution I expected.
Someday I want to be strong enough to earn KGS[-].
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Marcus
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Re: Problem Nr. 344 from Cho's intermediate Problems
I know! Actually, it's a great problem for studying how many different ways black can live, if White deviates almost anywhere.Chew Terr wrote:...I'll tell you, that's not the solution I expected.
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entropi
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Re: Problem Nr. 344 from Cho's intermediate Problems
Indeed, such an innocent looking position being the (one of the) most difficult problem(s) ever. I wonder what comes next!!!Chew Terr wrote:...I'll tell you, that's not the solution I expected.
If you say no, Elwood and I will come here for breakfast, lunch, and dinner every day of the week.
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HermanHiddema
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Re: Problem Nr. 344 from Cho's intermediate Problems
Well, if we're posting innocent looking positions....entropi wrote:Indeed, such an innocent looking position being the (one of the) most difficult problem(s) ever. I wonder what comes next!!!Chew Terr wrote:...I'll tell you, that's not the solution I expected.
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cyclops
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reverse tsumego
Herman solved this intriguing tsumego in the forward drive. How about going in reverse drive.Nagilum wrote:
It seems Wa is the only move to prevent unconditional black live. So this diagram solves the tsumego backwards. How far can we thus rewind the position?
Is reverse tsumego a respectable aberation? Or should I seek help?
Had it a name already?And then what about allowing tenuki ? ( But not two consecutive tenuki, and only if alternate reversing is impossible )