jlt wrote:
Katago sees this:
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| Tsumegos from real games http://lifein19x19.com/viewtopic.php?f=15&t=17076 |
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| Author: | Joaz Banbeck [ Sat Feb 12, 2022 11:57 am ] |
| Post subject: | Re: Tsumegos from real games |
Problem #30: This looks like fun. It might work.
The simple pull back does not work for white:
So maybe white tries the counter attack, but leaves the aji at J17
Now it is two kos. I'm not really sure how this ends. |
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| Author: | kvasir [ Sat Feb 12, 2022 12:11 pm ] |
| Post subject: | Re: Tsumegos from real games |
jlt wrote: Katago sees this: It is a nice one. It is a hard one, at least I think so. Do you have the answer to this, white is threatening to make an eye so I assume  onward.
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| Author: | jlt [ Sat Feb 12, 2022 12:19 pm ] |
| Post subject: | Re: Tsumegos from real games |
Why not at A12 ? |
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| Author: | jlt [ Sat Feb 12, 2022 12:42 pm ] |
| Post subject: | Re: Tsumegos from real games |
Actually if White makes the exchange a-b first then Black does have to pull back at
This might finish with a seki by double ko (with Black taking sente)? Not absolutely sure. |
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| Author: | kvasir [ Sat Feb 12, 2022 12:49 pm ] |
| Post subject: | Re: Tsumegos from real games |
Yeah getting the 1st line hane.
Now black has the hane-capture and this very botty-clamp. I have lost a few capturing races to bots when they pull something like this but I am sort of lost.
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| Author: | kvasir [ Sat Feb 12, 2022 1:08 pm ] |
| Post subject: | Re: Tsumegos from real games |
Joaz Banbeck wrote: Problem #30: The cross cut might fail like this. At least I don't see what to do after white captures 
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| Author: | Joaz Banbeck [ Sat Feb 12, 2022 4:12 pm ] |
| Post subject: | Re: Tsumegos from real games |
kvasir wrote: Joaz Banbeck wrote: Problem #30: The cross cut might fail like this. At least I don't see what to do after white captures ...
Oops. I missed move 10. |
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| Author: | Harleqin [ Mon Feb 14, 2022 2:57 am ] |
| Post subject: | Re: Tsumegos from real games |
I thought this makes the corner alive, but the weakness at 'a' is a bit annoying. Maybe that's the price to pay, though.
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| Author: | jlt [ Mon Mar 14, 2022 12:31 am ] |
| Post subject: | Re: Tsumegos from real games |
Problem #31, White to play. Interesting life and death situation on the bottom right.
Possible answer:
Black's side group is dead. The goal of the exchange   is to avoid sequences such as
however White could have made the exchange a-b at anytime. |
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| Author: | jlt [ Thu May 05, 2022 2:43 am ] |
| Post subject: | Re: Tsumegos from real games |
Problem #32, Black to play.
Answer:
In the game I played S18 My opponent didn't manage to punish
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| Author: | jlt [ Mon Aug 15, 2022 3:39 am ] |
| Post subject: | Re: Tsumegos from real games |
Problem #33, Black to play. This one was DDK level, how could I miss it?
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| Author: | xela [ Mon Aug 15, 2022 4:21 am ] |
| Post subject: | Re: Tsumegos from real games |
I wouldn't say DDK level. I fell into the temptation to be too clever... First attempt (wrong)
It's cute that  doesn't capture  . One of my favourite shapes. But...
Oops Second attempt
Now 'a' and 'b' are miai. |
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| Author: | jlt [ Wed Aug 24, 2022 6:15 am ] |
| Post subject: | Re: Tsumegos from real games |
Problem #34, White to play
Answer
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| Author: | jlt [ Fri Oct 28, 2022 2:20 am ] |
| Post subject: | Re: Tsumegos from real games |
Problem #35. This is from a correspondence game on OGS, 1d vs 2d, I was Black. We both misread the following life and death problem. White to play.
In the game White played M17 What is then the status of the white group, and what is the correct response for Black? Answer
After the game move, White is dead.
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| Author: | jlt [ Sat Aug 26, 2023 2:09 am ] |
| Post subject: | Re: Tsumegos from real games |
Problem #36, Black to play.
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| Author: | kvasir [ Sat Aug 26, 2023 1:58 pm ] |
| Post subject: | Re: Tsumegos from real games |
Like this?
looks vital but can't connect with
White can also play a threat for  but I think black can protect
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| Author: | jlt [ Sun Aug 27, 2023 1:02 am ] |
| Post subject: | Re: Tsumegos from real games |
I didn't show the whole board so there is not enough information to determine who wins the ko. Anyway what I missed in the game was that I could get a ko. |
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| Author: | jlt [ Tue Oct 03, 2023 12:37 pm ] |
| Post subject: | Re: Tsumegos from real games |
Problem #37, White to play. Black has just invaded the corner on the top left, what can White do?
Possible variation:
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| Author: | jlt [ Wed Dec 27, 2023 10:03 am ] |
| Post subject: | Re: Tsumegos from real games |
Problem #38, White to play.
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| Author: | kvasir [ Thu Dec 28, 2023 9:11 am ] |
| Post subject: | Re: Tsumegos from real games |
Like this?
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