Re: [gnugo-devel] Seki during nakade

[SP Lee]

> SP Lee wrote:
> > As far as I know, gnugo doesn't know the following seki case. It
> > said white is alive while black 3 stones are dead.
> >
> >    A B C D E F G H J
> >  9 . O . X X X . O . 9
> >  8 X O O O O O O O X 8
> >  7 X X + . . . + X X 7
> >  6 . . X X X X X . . 6
> >  5 . . . . + . . . . 5
> >  4 . . . . . . . . . 4
> >  3 . . + . . . + . . 3
> >  2 . . . . . . . . . 2
> >  1 . . . . . . . . . 1
> >    A B C D E F G H J
> >
> > I could add several test cases for such situations, but is it worth
> > to make the engine more complex at current stage?
>
> Essentially we have all the necessary machinery to solve such problems
> so I think it's worth some test cases.
>
> /Gunnar
>
>

Here are two test cases for the similar situations.

SP Lee

$ cvs diff -u seki.tst
Index: seki.tst
===================================================================
RCS file: /cvsroot/gnugo/gnugo/regression/seki.tst,v
retrieving revision 1.7
diff -u -r1.7 seki.tst
--- seki.tst    24 Jan 2004 04:04:57 -0000      1.7
+++ seki.tst    12 Feb 2004 21:45:49 -0000
@@ -502,3 +502,19 @@
 loadsgf games/FSGCBot-dr.sgf 234
 2010 reg_genmove white
 #? [A19|B17]
+
+loadsgf games/seki_nakade1.sgf
+2020 dragon_status D9
+#? [alive]
+
+loadsgf games/seki_nakade2.sgf
+2030 dragon_status F9
+#? [critical H9 H9]
+
+play white H9
+play white H7
+play white G7
+play white G9
+
+2050 dragon_status G8
+#? [alive]



begin 666 seki_nakade2.sgf
M* T*.PT*1D9;,5T-"D=-6S%=#0I36ELY70T*05!;2F%G;SI697)S:6]N(#0N
M-3-=#0I!0EMG8EU;:&)=6VEB75ME85U;96)=6V5C75MF9EU;:&5=6VAF75MD
M95U;9&1=6V-C75ME9ET-"D%76V9A75MF8EU;9F-=6V=D75MH9%U;:61=6V9D
170T*1TY;<V5K:3%=#0HI#0H`
`
end

begin 666 seki_nakade1.sgf
M* T*.PT*1D9;,5T-"D=-6S%=#0I36ELY70T*05!;2F%G;SI697)S:6]N(#0N
M-3-=#0I!0EMD85U;96%=6V9A75MA8EU;86-=6V-D75ME9%U;9F1=6V=D75MD
M9%U;:6-=6VEB75MH8UU;8F-=#0I!5UMB85U;8F)=6V-B75MD8EU;96)=6V9B
=75MG8EU;:&)=6VAA70T*1TY;<V5K:3-=#0HI#0H`
`
end