Re: [gnugo-devel] very specific defense pattern

[SP LEE]

> this patch adds a very specific defense pattern.  see attached
> position.  since defense pattern database is in no way time
> critical, such patterns are perfectly acceptable.
>
> Paul
>
>
> Index: patterns/defense.db
> ===================================================================
> RCS file: /cvsroot/gnugo/gnugo/patterns/defense.db,v
> retrieving revision 1.10
> diff -u -p -r1.10 defense.db
> --- patterns/defense.db 18 Jul 2003 18:59:22 -0000      1.10
> +++ patterns/defense.db 11 Aug 2003 20:22:14 -0000
> @@ -385,3 +385,13 @@ aC*
>
>  ;lib(a)>1 && lib(b)>1 && lib(C)<=2 && olib(*)>1
>
> +
> +Pattern Def70
> +# pp New Pattern (3.5.1)
> +
> +OOOO*    a very specific position (defend the stone on the first line)
> +O....
> +XO...
> +-----
> +
> +:8,D
> << specific-position.sgf >>

I thought this pattern is little strange first. Then I understand the 
opponent might capture the stone on the first line if lacking of liberty. 
Should this be an endgame pattern? Should the liberty check be added? If 
there is no enemy stone above *, this defense may not be urgent.

SP Lee

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