In your last variation, I would play
one point below:IMHO black can capture the marked stone but not connect.
EDIT: Does not work because of
on E5 
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| puzzling tsumego http://www.lifein19x19.com/viewtopic.php?f=15&t=9663 |
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| Author: | otenki [ Thu Jan 09, 2014 8:44 am ] |
| Post subject: | puzzling tsumego |
Hi guys, In this problem it is black to play in order to connect his group up. The solution by the book (lee chang ho tesuji vol 3) is : Howhever... someone from our go club sugested to start with D3. This way black does not need to sacrifice two stones and is also connected. I tried to refute this with F3 but then there is E5. Is there a refutation for D3 or is the answer in the book wrong ? Thanks! Otenki |
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| Author: | mipli [ Thu Jan 09, 2014 9:13 am ] |
| Post subject: | Re: puzzling tsumego |
Looks to me like this works as a refutation for that |
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| Author: | otenki [ Thu Jan 09, 2014 9:15 am ] |
| Post subject: | Re: puzzling tsumego |
mipli wrote: Looks to me like this works as a refutation for that How about if the reply is e2 ? (note that 6 cannot be played at f1) eg: |
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| Author: | mipli [ Thu Jan 09, 2014 9:23 am ] |
| Post subject: | Re: puzzling tsumego |
otenki wrote: How about if the reply is e2 ? (note that 6 cannot be played at f1) eg: That's true. Brain decided to not work for a moment while I read that sequence it seems. Back to thinking about other options then. |
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| Author: | DrStraw [ Thu Jan 09, 2014 9:27 am ] |
| Post subject: | Re: puzzling tsumego |
So, the result seems like ko. Did I miss anything? |
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| Author: | otenki [ Thu Jan 09, 2014 9:30 am ] |
| Post subject: | Re: puzzling tsumego |
DrStraw wrote: So, the result seems like ko. Did I miss anything? How about: |
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| Author: | DrStraw [ Thu Jan 09, 2014 9:37 am ] |
| Post subject: | Re: puzzling tsumego |
Ha! I forgot the obvious! I was just looking at the comment "what about E5?" |
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| Author: | schawipp [ Thu Jan 09, 2014 9:45 am ] |
| Post subject: | Re: puzzling tsumego |
In your last variation, I would play one point below:IMHO black can capture the marked stone but not connect. EDIT: Does not work because of on E5
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| Author: | HermanHiddema [ Thu Jan 09, 2014 9:55 am ] |
| Post subject: | Re: puzzling tsumego |
otenki wrote: Howhever... someone from our go club sugested to start with D3. This way black does not need to sacrifice two stones and is also connected. I tried to refute this with F3 but then there is E5. Is there a refutation for D3 or is the answer in the book wrong ? D3 is my first instinct, and I can find no refutation. Either E2 or E5 will work, depending on how white plays. The book solution also solves the problem in that it connects, but otherwise seems inferior. |
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| Author: | Kirby [ Thu Jan 09, 2014 10:58 am ] |
| Post subject: | Re: puzzling tsumego |
I feel that D3 is probably better, for the obvious reason that it doesn't give two stones. However, there are more complicated considerations than just connecting. I still suspect D3 was better, but here were my initial thoughts... If black plays D3, white can play like this: Now white can tenuki - black got some points, but there aren't a ton of points. If you count the marked intersections, that's 13 points. Now, white has sente. If black plays as in the book and white does tenuki, then black can play here, and get many more points: So I figured, the book solution was more sente than D3. But this logic doesn't hold, because as shown in the book variation, white can keep playing forcing moves to force black to connect: After this, white still gets sente, and has more points. So if we consider just the single move, D3 or E5, I feel that E5 is more of a sente move - white would be more inclined to answer it immediately if it's played. But if black really wants to connect these stones, the end position sequence in the book is worse for black than the end position I gave above where white gets sente. So... I think D3 is better. |
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| Author: | cyclops [ Thu Jan 09, 2014 6:13 pm ] |
| Post subject: | Re: puzzling tsumego |
Kirby wrote: So if we consider just the single move, D3 or E5, I feel that E5 is more of a sente move - white would be more inclined to answer it immediately if it's played. ........ To me this sounds funny. If B can afford to tenuki after starting the sequence he shouldn't have started it. I guess. |
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| Author: | cyclops [ Thu Feb 27, 2014 3:15 pm ] |
| Post subject: | Re: puzzling tsumego |
Totally nonsense or essentially correct? |
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