In message <[email protected]>, Rémi Coulom
<[email protected]> writes
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 >?
I am puzzled. L17 is adjacent to two white stones, but these white
stones are dead. L17 is black territory.
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
[ A MIME application / octet-stream part was included here. ]
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...
Something must be wrong. There are problems in this position. But S6
is not one of them, it is very clearly black territory. Maybe you have
the wrong SGF files, or they have been rotated?
Nick
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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Nick Wedd [email protected]
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