jmeinh wrote:
... we have a first (temporary?) seki.
Yes, indeed.
But ...
...
is a mistake, ...... as well as
.
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| The most difficult yose problem http://www.lifein19x19.com/viewtopic.php?f=12&t=18589 |
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| Author: | dany [ Sun Jan 30, 2022 1:05 pm ] |
| Post subject: | The most difficult yose problem |
Masterpiece created by Cho U 9 dan |
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| Author: | lichigo [ Sun Jan 30, 2022 1:14 pm ] |
| Post subject: | Re: The most difficult yose problem |
Wouah indeed really hard. Where did you find this problem? |
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| Author: | dany [ Tue Feb 08, 2022 7:53 am ] |
| Post subject: | Re: The most difficult yose problem |
Several years ago, in his lecture, Alexander Dinerstein 3p talked about solving this problem. But imho not all the important moves were explained in his lecture, and some were wrong Will someone try to find a solution? |
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| Author: | kvasir [ Tue Feb 08, 2022 10:01 am ] |
| Post subject: | Re: The most difficult yose problem |
That is good example of the maxim that yose is also a life and death problem. |
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| Author: | Gérard TAILLE [ Wed Feb 09, 2022 4:05 am ] |
| Post subject: | Re: The most difficult yose problem |
dany wrote: Several years ago, in his lecture, Alexander Dinerstein 3p talked about solving this problem. But imho not all the important moves were explained in his lecture, and some were wrong Will someone try to find a solution? This problem is quite difficult but I can try to find something. Just a confirmation : seeing 53 black stones against 45 white stones is it a good understanding that japanese rules are used for this problem? |
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| Author: | dany [ Wed Feb 09, 2022 5:56 am ] |
| Post subject: | Re: The most difficult yose problem |
Gérard TAILLE wrote: This problem is quite difficult but I can try to find something. Just a confirmation : seeing 53 black stones against 45 white stones is it a good understanding that japanese rules are used for this problem? Yes, Japanese rules, komi 0.5 |
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| Author: | Cassandra [ Thu Feb 10, 2022 3:17 am ] |
| Post subject: | Re: The most difficult yose problem |
Let's start ... |
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| Author: | Harleqin [ Thu Feb 10, 2022 7:21 am ] |
| Post subject: | Re: The most difficult yose problem |
Yes, seems so, and then Then 'a' or 'b'? What's that funny shape in the corner? |
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| Author: | Cassandra [ Thu Feb 10, 2022 8:05 am ] |
| Post subject: | Re: The most difficult yose problem |
Harleqin wrote: What's that funny shape in the corner? Probably aiming at a fight for creating a seki in the corner??? |
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| Author: | Gérard TAILLE [ Thu Feb 10, 2022 11:31 am ] |
| Post subject: | Re: The most difficult yose problem |
Harleqin wrote: Yes, seems so, and then Then 'a' or 'b'? What's that funny shape in the corner? As far as I am concerned I see a quite simple win for black for this yose. As a consequence I know for sure that I did not fond the good defense for white. My best sequence begins with your suggestion Harleqin: but now I failed to find an interesting move for white. I tried: but now I do not see how white can cause difficulties for black. Surely I missed a hidden move somewhere. |
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| Author: | Cassandra [ Thu Feb 10, 2022 11:43 am ] |
| Post subject: | Re: The most difficult yose problem |
Gérard TAILLE wrote: ... I do not see how white can cause difficulties for black. Surely I missed a hidden move somewhere. Here you are! |
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| Author: | jmeinh [ Thu Feb 10, 2022 12:31 pm ] |
| Post subject: | Re: The most difficult yose problem |
Cassandra wrote: Gérard TAILLE wrote: ... I do not see how white can cause difficulties for black. Surely I missed a hidden move somewhere. Here you are! Then maybe after... ... we have a first (temporary?) seki. |
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| Author: | Cassandra [ Thu Feb 10, 2022 2:11 pm ] |
| Post subject: | Re: The most difficult yose problem |
jmeinh wrote: ... we have a first (temporary?) seki. Yes, indeed. But ... ... is a mistake, ...... as well as .
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| Author: | Gérard TAILLE [ Fri Feb 11, 2022 10:40 am ] |
| Post subject: | Re: The most difficult yose problem |
Cassandra wrote: Harleqin wrote: What's that funny shape in the corner? Probably aiming at a fight for creating a seki in the corner??? Locally this white move is good but globally it seems to me quite bad. Here again sure I missed something. |
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| Author: | lightvector [ Fri Feb 11, 2022 11:47 am ] |
| Post subject: | Re: The most difficult yose problem |
What if white ignores black move 17 and instead just connects the ko? |
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| Author: | Cassandra [ Fri Feb 11, 2022 11:50 am ] |
| Post subject: | Re: The most difficult yose problem |
Lightvector was faster with his posting, as his name already suggests  Now, White has a wild bunch of ko-threats in the lower left corner. |
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| Author: | dany [ Fri Feb 11, 2022 12:04 pm ] |
| Post subject: | Re: The most difficult yose problem |
Cassandra wrote: Lightvector was faster with his posting, as his name already suggests Now, White has a wild bunch of ko-threats in the lower left corner. up to 20 move everything is correct. subsequent moves will be more difficult |
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| Author: | Cassandra [ Sat Feb 12, 2022 3:41 am ] |
| Post subject: | Re: The most difficult yose problem |
Black is unable to turn the lower right corner into a seki. After  White has 22 points of territory on the board, while Black has only 21.White will gain an additional five prisoners in the seki in the lower left corner, starting with capturing at A. |
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| Author: | Gérard TAILLE [ Sat Feb 12, 2022 4:35 am ] |
| Post subject: | Re: The most difficult yose problem |
dany wrote: Cassandra wrote: Lightvector was faster with his posting, as his name already suggests Now, White has a wild bunch of ko-threats in the lower left corner. up to 20 move everything is correct. subsequent moves will be more difficult Yes Dany, for the time being I did not find the good sequence for black. In the sequence here under white wins by 0.5 points => I need to gain still one point for black. Very hard indeed. |
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| Author: | dany [ Sat Feb 12, 2022 5:46 am ] |
| Post subject: | Re: The most difficult yose problem |
Gérard TAILLE wrote: Very hard indeed. Not yet  White win ko and game. H12 unnecessary move |
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