7x7 Best Play
PurpleHaze: simplest variation...
chipuni: How is this defined as best play? How was this determined?
PurpleHaze: A group of New Zealand dan players over the course of several years with the assistance of computers and a few Japanese pros.
gimpf: Maybe for such things we should add always when possible a bibliographical reference. Don't trust best play by amateurs...
RobertJasiek: Anything about perfect play without a rules text and a mathematical proof is not serious.
PurpleHaze: Fine, I looked up my notes: the rule set is NZ (no suprise) and the pros were Kudo Norio and Nakayama Noriyuki. My source was a post to rec.games.go by Bill Taylor.
After checking Google, the post may have been this one (but this is not how I remember it): http://groups.google.ca/groups?q=%22Bill+Taylor%22+7x7+group:rec.games.go&hl=en&lr=&ie=UTF-8&group=rec.games.go&selm=CGpsqI.rz%40cantua.canterbury.ac.nz&rnum=1
And Jasiek and Taylor have argued this point before: http://groups.google.ca/groups?q=%22Bill+Taylor%22+7x7+group:rec.games.go&hl=en&lr=&ie=UTF-8&group=rec.games.go&selm=7vggql%24iog%242%40cantuc.canterbury.ac.nz&rnum=6
There is also an article in the summer 1995 edition of the American Go Journal by James Davies.
JaredBeck: Can we assume by the score of 19-10 that komi on 7x7 should be 9? Or should it be 9.5? 8.5?
lightvector: As of late 2021, the latest knowledge on fair komi for 7x7 is that it's probably *8* for Japanese rules, but still 9 for Chinese rules, although not mathematically rigorously solved. See here for https://katagobooks.org/ for variation trees, https://lifein19x19.com/viewtopic.php?f=18&t=17502&view=previous on the critical line responsible for it being 8 komi, and https://katagobooks.org/7x7highlights.html for some commentary on other interesting differences/oversights in earlier solution attempts.
The Count: One of the comments in that .sgf seems to be wrong. However, the introductory comment given before move 1 seems to imply that all comments are taken from James Davies who wrote an article in the American GO Journal about it (Vol 29, #3, 1995).
The Count: According to the .sgf linked above, is equally good as at a. Then after , Black apparently has 4 equally good moves at a through d. However, after at d, White cannot prevent a Black win by 11 points (instead of the "perfect play" 9 points), at least in all the variations shown in the .sgf. Does anyone have a copy of this Journal to verify whether the double hane of in the original diagram was a mistake?
Here the 7x7ArticleByJDavies
After reading Davies' article I realised the investigation in Davies article was done using the JapaneseRules The sgf uses the NewZealandRules. But that is insufficient to explain the difference in this case. All this with thanks to the American Go Association for sending me copies of Davies article.