Hi,

I tested Crazy Stone's Japanese scoring over this database of games. I wonder 
about one of them (attached), 003_006.sgf. Shouldn't L17 be dame ?

Attachment: 003_006.sgf
Description: Binary data


BTW, I also tested my Japanese scoring in games against GNU. I found a few bugs 
of GNU in this process. I attached one such game. In the final position I get 
(with GNU 3.8):
final_status_list dame
= T19 T17 K15 O14 B12 N12 S12 T11 T8 S7 S5 P1

Attachment: japanese-test-7.sgf
Description: Binary data


Crazy Stone is probably wrong, too, because there are some complicated things 
happening around S6. I would say  S6 is dame, not S7 and S5. B12 and P1 look 
like really weird dame, though. So do K15 and N12. The right-side of the board 
is complicated, but the rest should be obvious for GNU. Unless I am mistaken... 

I can send more, if GNU people are interested.

Rémi

On 30 nov. 2010, at 00:24, Gunnar Farnebäck wrote:

> On 11/28/10 10:15, Dave Dyer wrote:
>> At 10:39 PM 11/27/2010, David Fotland wrote:
>>> Accurate scoring, even at the end of a game, is very difficult.  You have to
>>> read accurately, and evaluate semeai and seki.
>> 
>> Yup.  I spent years developing the capability to score endgames
>> at the point where humans typically leave them.  Getting within
>> a few points of correct 95% of the time is achievable.  The other
>> 5% you will either make whopper mistakes or never terminate.
>> 
>> This is now pretty old, but I don't know of any more recent or better
>> results. http://www.andromeda.com/people/ddyer/go/scoring-games.html
> 
> On that testset GNU Go 3.8 finds the correct score in 85.6% of the
> cases, is off by at most one point in 98.2% and within 3 points in
> 99.4%.
> 
> And well, it can be argued whether humans in general (as opposed to go
> pros) consider the game finished and ready to be scored with open kos
> remaining.
> 
> /Gunnar
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