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Re: [gnugo-devel] Inaccurate estimate_score
From: |
Darren Cook |
Subject: |
Re: [gnugo-devel] Inaccurate estimate_score |
Date: |
Tue, 29 Mar 2005 13:59:07 +0900 |
User-agent: |
Mozilla Thunderbird 0.9 (X11/20041127) |
> I don't think you can hope for consistently reliable ranges, but this
> may very well be a bug anyway. The algorithm for estimate_score was
> changed in 3.7.2. Can you try it again with 3.7.2 or 3.7.3 (or current
> CVS) and report the results?
Here are the results using 3.7.3; I've repeated the 3.6 results below.
= W+60.5 [correct]
= W+61.1 (upper bound: 61.1, lower: 61.1)
= 59.6 [better: should be 60.5]
= 62.1 [better: should be 61.5]
experimental_score's range is now correct, so may be useful to me; I'll
try it on some more positions.
estimate_score is still strange: surely upper and lower bounds should
only be equal when the only moves left are filling dame? Or does
upper/lower bound only take into account unsettled groups? If so
clarifying the docs would be useful.
Darren
[1]:
showboard
final_score
estimate_score
experimental_score black
experimental_score white
[2]:
=
A B C D E F G H J
9 . X X . . . . . . 9
8 X . X O O O . . . 8
7 X X X O . O + . . 7
6 . . X O . . O . . 6
5 O O O . + . . O O 5
4 . . X O O . . . . 4
3 X X X O . O O O . 3
2 . . . O . O . . O 2 WHITE (O) has captured 12 stones
1 O O O O . . . . . 1 BLACK (X) has captured 1 stones
A B C D E F G H J
= W+60.5
= W+59.5 (upper bound: 59.5, lower: 59.5)
= 58.0
= 60.5