It is currently Fri Oct 19, 2018 11:39 pm

All times are UTC - 8 hours [ DST ]




Post new topic Reply to topic  [ 3 posts ] 
Author Message
Offline
 Post subject: James Davies - life and death - definition + rules
Post #1 Posted: Thu Apr 26, 2018 8:59 am 
Tengen

Posts: 4674
Liked others: 0
Was liked: 629
References:
forum/viewtopic.php?p=225367#p225367
forum/viewtopic.php?p=230291#p230291

"Stones are 'alive' if they cannot be captured." is very and fundamentally wrong. Formal definitions are here:

http://home.snafu.de/jasiek/j2003.html
http://home.snafu.de/jasiek/wagcmod.html
http://home.snafu.de/jasiek/sj.html
http://ljrg.eu5.net/
Mathematicap Go Endgames, chapter B.2
Olmsted's rules in The Structure of Go and The Rationalisation of Go

In particular note that normal go has three types of capturability-life: uncapturable, capturable-1, capturable-2. See also

http://home.snafu.de/jasiek/j2003com.html
http://home.snafu.de/jasiek/j1989c.html
http://home.snafu.de/jasiek/wagcflaw.html

Top
 Profile  
 
Offline
 Post subject: Re: James Davies - life and death - definition + rules
Post #2 Posted: Thu Apr 26, 2018 10:05 am 
Tengen

Posts: 4166
Location: North Carolina
Liked others: 431
Was liked: 682
Rank: AGA 3k
GD Posts: 65
OGS: Hyperpape 3k
Do any of the links directly address the definition that stones are alive iff they cannot be captured? I see that the 2003 Japanese rules state a different definition, but does not seem to state why the difference is present or in what situations the one definition gives incorrect results.

_________________
Occupy Babel!

Top
 Profile  
 
Offline
 Post subject: Re: James Davies - life and death - definition + rules
Post #3 Posted: Thu Apr 26, 2018 10:25 am 
Tengen

Posts: 4674
Liked others: 0
Was liked: 629
See the examples referred to by the other links. The most basic shape class: eyespace with capturable-1 (live) stones inside. To be learnt before snapback.

For answers to your other questions, do read the linked commentaries.

Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 3 posts ] 

All times are UTC - 8 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group