Re: [gnugo-devel] Re: Full board strategy component

[SP LEE]

> As a very rusty Shodan, if that, my ability to judge the reliability of the
> data being generated is limited, so I really appreciate feedback!
>
> If indeed J7 is sente, and not an overplay, is this because it is splitting
> the various black groups? The FBS algorithm's first guess is that the lone
> White stone peaking out at J5 (K5 being totally blocked off) is rather
> out-numbered, at present, and that the split groups are both fairly 
> healthy. Some
> prepatory moves could raise the viability of a J7 play. In fact, the 
> highest
> recommended move, L13, is deemed to improve the J7 rating slightly.
>
> One thing I'd like to see is if known sente points could be fed to the Full
> Board Strategy component. And, if known boundaries of groups could be
> integrated in a meaningful way.
>
> How much improvement is necessary (and what would it look like) before the
> recommendations provided by this sort of component becomes helpful? I 
> assume
> "usually reasonable" full-board suggestions are better than random choices, 
> if
> they can be derived at a minimum cost in cpu's, and they can be overridden 
> by
> the more precise local reading algorithms.
>
> - Phil Freihofner

Maybe you are stronger than me. Playing J7 directly seems to be indeed 
overplay. Of course when there are more white stones around the center the 
situation will be different and the numbers will also change.

Unfortunately I'm almost a new comer and can't say when the code will be 
useful. As far as I know, there is a influence module in gnugo and it does 
the similar thing. There is also a cosmic patch which generates a different 
version of the influence module.

However, I do think gnugo need some improvement in this area. Take an 
example from the game posted by Dan in 
http://mail.gnu.org/archive/html/gnugo-devel/2003-07/msg00125.html. At move 
49, gnugo finds the best move F9 which is only valued 11 points. At this 
early stage of the game, there are many big moves almost everywhere. With 
the cosmic patch, gnugo finds a good move at N7 valued 40 points. When I 
replayed the game with the cosmic patch, there are still some cases the best 
moves are less than 10 points in the early stage.

Apparently, I think, when the best move is valued not so high, it means 
gnugo doesn't know very well what to do in the specific situation, 
especially possible followup moves may not be seen very well. I hope tuning 
the influence module can improve gnugo in this aspect.

SP Lee

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