Re: computer-go: Live or Die

["Hans F. Zschintzsch" <hfz@xxxxxxxxxxx>]

Tim Klinger schrieb:
> 
> On Mon, 6 Dec 1999, Jeff Massung wrote:
> 
> > Could someone give me some examples of eyes that are more than 1 space in
> > size?
> >
> > Thanks.
> > Jeff
> 
> x x x
> x . x
> x . x

It is probably always bad for X to play b2, but it is
not always a bad play for O, as the example below shows.

  . . . . . . . . . .  
  . o o o o x x x . .  
  . o x x x o o x . .
  . o x . x . o x . x
  . o x . x o o o x .   Lower edge, O to play
  . o x x x o . o x .   (outer stones alive)

It is hard to indicate "bad moves" from a pur local view of
e.g. 3x3 or 5x5 regions extracted around a free point from 
a full board position.

Candidate move at ? good (or even necessary) or bad, 
local 5x5 region of example:
  
    o o o o x  
    o x x x o 
    o x ? x . 
    o x . x o   
    o x x x o

There are already a lot 5x5 regions around a free point.
My (almost) random Go playing program marks ~10..20 points 
as "bad" when comparing 5x5 subboards agains a database 
of 5x5 patterns. (of course only near the end of a game, with 
already a lot of unnecessary moves -by human standards- made).

Hans