Tsumego pro is a very nice app for android tablets and provides daily exercises. Today it bluntly declared my solution to the first hard problem as wrong. I am not sure tsumegopro is correct.
Thx for your advice.
black to play ...
today's problem of tsumegopro
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cyclops
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today's problem of tsumegopro
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Last edited by cyclops on Sat May 24, 2014 3:13 pm, edited 1 time in total.
I think I am so I think I am.
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cyclops
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Re: today's problem of tsumegopro
Here my solution and tsumego's solution
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I think I am so I think I am.
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Inkwolf
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Re: today's problem of tsumegopro
EDIT: D'oh. deleting my answer, didn't notice the atari on the upper side....why I'm still on the beginner problems...
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cyclops
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Re: today's problem of tsumegopro
Bonobo showed me how to become famous by answering your own questions. So here I go.
at a or at be that is the question.
1.
and both proof that the combination 
solves the problem.
2. Both a and b proof that equally well. In that sense there is no best
3. the app shouldn't disapprove of my solution ( at a ).
3. w won't answer until the endgame or as threats in a ko fight.
4. If in a ko fight W eventually threatens at
B will answer at a because the penalty of not answering it is more severe than after b.
5. The proverb sente first gote later is a good guide in situations like this.
6. Only if you can attack W's south wing playing at b might be better.
at a or at be that is the question.1.
and both proof that the combination solves the problem.2. Both a and b proof that equally well. In that sense there is no best
3. the app shouldn't disapprove of my solution (
at a ).3. w won't answer
until the endgame or as threats in a ko fight.4. If in a ko fight W eventually threatens at
B will answer at a because the penalty of not answering it is more severe than after b.5. The proverb sente first gote later is a good guide in situations like this.
6. Only if you can attack W's south wing playing
at b might be better.I think I am so I think I am.
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Bill Spight
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Re: today's problem of tsumegopro
"a" and "c" are miai, forming a two-way ko threat. Since White's threat is much larger than Black's, it can hardly be wrong for Black to play at "a" to eliminate White's threat.cyclops wrote:Bonobo showed me how to become famous by answering your own questions. So here I go.
Besides,
and are for illustrative purposes. In a real game White would play first. 
The Adkins Principle:
At some point, doesn't thinking have to go on?
— Winona Adkins
Visualize whirled peas.
Everything with love. Stay safe.
At some point, doesn't thinking have to go on?
— Winona Adkins
Visualize whirled peas.
Everything with love. Stay safe.
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cyclops
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Re: today's problem of tsumegopro
So next diagram shows the normal evolution. In hindsight my question was not of that much interest.Bill Spight wrote: Besides,
I think I am so I think I am.
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Bill Spight
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Re: today's problem of tsumegopro
Well, in a real game, White would probably play elsewhere aftercyclops wrote:So next diagram shows the normal evolution. In hindsight my question was not of that much interest.Bill Spight wrote: Besides,
, saving 
, , and as potential ko threats. But in a problem it is important to have White play them. is important, because Black could misplay . and are important to show that White cannot take away the eye on the second line because of damezumari. But it is silly to criticize your
in the problem line, and, to judge from complaints here, that kind of thing is not uncommon with interactive problem software. I think that that is an important issue to raise.The Adkins Principle:
At some point, doesn't thinking have to go on?
— Winona Adkins
Visualize whirled peas.
Everything with love. Stay safe.
At some point, doesn't thinking have to go on?
— Winona Adkins
Visualize whirled peas.
Everything with love. Stay safe.
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cyclops
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Re: today's problem of tsumegopro
Thx, Bill, for your clarifications.
For completeness I added my refutation for another .
For completeness I added my refutation for another
.
I think I am so I think I am.