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Score estimator bug
Posted: Sun Jul 10, 2011 3:20 pm
by Numsgil
I know there are quite a few score estimator bugs, but this one seems especially puzzling.
There's a large seki in the center of the board. If I use the "Scoring" tool, I get a score of something like B+6 (there are prisoners). If I use score estimator, it seems to figure out the correct status of all the stones, but comes up with a score of W+50.
See the position at the end of the attached SGF.
$$Bc
$$ +---------------------------------------+
$$ | . X O O . . . . O . X . . . . . . . . |
$$ | . X X O . O X . O X X X X X X . . . . |
$$ | . X O O . . O X O O X O O O X O X . . |
$$ | . X X O . O . X . O X X O O O X X . . |
$$ | . . X X O . X . . . O X O . O O O X . |
$$ | . . X O O . X O . O O O X O . X O X . |
$$ | . X X X O . O O . . O O X O . O X . . |
$$ | X X O O X O O X . O . O X O O O X . . |
$$ | X O . O X O X . X . O X X X O X . . . |
$$ | O O O O X O X X . , O O O X X X X . . |
$$ | O X X O X O O O O O O X . O O X . X . |
$$ | . X X X X O X O X O X O O O X X X X X |
$$ | X X O X X X X X X X X O X O O O . O . |
$$ | O O O X . X X X O O X X X X X O O O O |
$$ | X X O O X X X X O O X O X O O O X O X |
$$ | . X X O O O O O O O O O O X X O X X X |
$$ | X . X O . O O X X X X O O O X X X X O |
$$ | . X X X O O . O X . X X X X X . X O . |
$$ | . X X O O . O O O X . . . . . . O . O |
$$ +---------------------------------------+
- Click Here To Show Diagram Code
[go]$$Bc
$$ +---------------------------------------+
$$ | . X O O . . . . O . X . . . . . . . . |
$$ | . X X O . O X . O X X X X X X . . . . |
$$ | . X O O . . O X O O X O O O X O X . . |
$$ | . X X O . O . X . O X X O O O X X . . |
$$ | . . X X O . X . . . O X O . O O O X . |
$$ | . . X O O . X O . O O O X O . X O X . |
$$ | . X X X O . O O . . O O X O . O X . . |
$$ | X X O O X O O X . O . O X O O O X . . |
$$ | X O . O X O X . X . O X X X O X . . . |
$$ | O O O O X O X X . , O O O X X X X . . |
$$ | O X X O X O O O O O O X . O O X . X . |
$$ | . X X X X O X O X O X O O O X X X X X |
$$ | X X O X X X X X X X X O X O O O . O . |
$$ | O O O X . X X X O O X X X X X O O O O |
$$ | X X O O X X X X O O X O X O O O X O X |
$$ | . X X O O O O O O O O O O X X O X X X |
$$ | X . X O . O O X X X X O O O X X X X O |
$$ | . X X X O O . O X . X X X X X . X O . |
$$ | . X X O O . O O O X . . . . . . O . O |
$$ +---------------------------------------+[/go]
Re: Score estimator bug
Posted: Sun Jul 10, 2011 3:23 pm
by Li Kao
Sekis never work with SE. If I recall correctly it thinks all stones in a seki are dead and counts them as prisoners.
Re: Score estimator bug
Posted: Sun Jul 10, 2011 3:24 pm
by Numsgil
But it graphically marks them as shaded, so it seems to understand the concept.
Re: Score estimator bug
Posted: Sun Jul 10, 2011 3:59 pm
by lefuet
iirc the score estimator is not improved anymore. the original programmer is gone. the estimator is just left as a convenience for us lazy counters. It still has many bugs but the alternative would be no estimator t all.
Re: Score estimator bug
Posted: Sun Jul 10, 2011 6:02 pm
by Dusk Eagle
See also
this thread. Judging from posts 15-19, I figure the score estimator will never be improved without a complete rewrite (which could be an interesting project).
Re: Score estimator bug
Posted: Mon Jul 11, 2011 12:56 am
by Harleqin
The score estimater is a bug. Its results are useless, since you cannot trust them even if they seem right at first glance. Just ignore its existence.
Re: Score estimator bug
Posted: Mon Jul 11, 2011 11:09 am
by Numsgil
Grr, reading that other thread I realize dead end code when I hear it
Can we expose a way to override it? For instance,
GnuGo can estimate the score. I figure WMS probably wants to keep an all Java client, but exposing a hook to the command line might be a reasonable midstep to a full replacement.
Re: Score estimator bug
Posted: Mon Jul 11, 2011 11:28 am
by topazg
You'd need to download the .sgf and load it in a separate window, but I recommend
http://ricoh51.free.fr/go/dariusheng.htm very highly with respect to score estimation