Re: [gnugo-devel] Gnu Go 3.2 possibly correctable flaw in play

[SP LEE]

> I noticed a possibly correctable flaw in Gnu Go 3.2 opening strategy.  The
> SGF file below shows the problem with Gnu Go's opening.  I can use the same 
> flaw
> to give Gnu Go 6 stones and still win, even though I'm not that good.  This
> trick of sacraficing a couple of stones to waste a lot of the programs 
> stones
> works against Swiss Explorer and Goliath also, but doesn't work against 
> human
> players.  This looks to me like a straightforward flaw that might not be 
> too
> hard to fix.
>
> - Stephen

The following patch might solve part of the problem. It's a rather standard 
approach to suppress the opponent influence from the corner. After the 
patch, gnugo plays K3 at move 12. For other shapes of the corner the 
approach may be also applicable, but for the moment we restrict this 
invasion in this safe case.

SP Lee

Index: fuseki.db
===================================================================
RCS file: /cvsroot/gnugo/gnugo/patterns/fuseki.db,v
retrieving revision 1.30
diff -u -r1.30 fuseki.db
--- fuseki.db   18 Jul 2003 18:59:22 -0000      1.30
+++ fuseki.db   26 Jul 2003 05:37:50 -0000
@@ -1537,6 +1537,29 @@
#:8,FsjE


+Pattern F707
+#sp added 3.5.1
+
+|..x............
+|..xx...........
+|...............         Urgent invasion
+|...X.....*.....
+|...............
+|...............
++---------------
+
+:8,sFIj
+
+|..a............
+|..bc...........
+|...............         Urgent invasion
+|...X.....*.....
+|...............
+|...............
++---------------
+
+;x_somewhere(a,b,c)
+
################
# Jumps
################

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