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Offline Clairo
 Post subject: Cho Chikun Advanced no. 13
Post #1 Posted: Wed Jun 29, 2022 8:47 am 
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I'm stuck on the attached life and death problem -- would appreciate some help! Black to play (no.13 from this one: https://tsumego.tasuki.org/books/cho-3-advanced.pdf)


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Offline Joaz Banbeck
 Post subject: Re: Cho Chikun Advanced no. 13
Post #2 Posted: Wed Jun 29, 2022 9:16 am 
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Offline dhu163
 Post subject: Re: Cho Chikun Advanced no. 13
Post #3 Posted: Wed Jun 29, 2022 10:12 am 
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Hint:

ah, but you shouldn't threaten the throw in as that only gives one forcing move whereas atari gives two. If you want to save cutting stones, either use the forcing moves or just don't save the cutting stone.


Hint2:
Despite such a small position, even with the correct answer there are perhaps 6+ W responses you have to check.


Last edited by dhu163 on Wed Jun 29, 2022 10:40 pm, edited 1 time in total.
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Offline Clairo
 Post subject: Re: Cho Chikun Advanced no. 13
Post #4 Posted: Wed Jun 29, 2022 10:01 pm 
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Still cannot see it :(



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Offline Harleqin
 Post subject: Re: Cho Chikun Advanced no. 13
Post #5 Posted: Thu Jun 30, 2022 1:32 am 
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You can go one space further on the first line.

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Offline Clairo
 Post subject: Re: Cho Chikun Advanced no. 13
Post #6 Posted: Thu Jun 30, 2022 3:47 am 
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Ok I think I got it, finally. Thanks for the hints



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Offline tcelferact
 Post subject: Re: Cho Chikun Advanced no. 13
Post #7 Posted: Fri Jul 28, 2023 9:13 am 
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Thanks to all posters, I found this really helpful! However, I think the best refutation for white is missing.

I believe if white plays the wedge at J18 after black's J19 then white can live on the right. Black does kill on the left though.


Please let me know if you think I've missed something!
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