Hi!
I have left the distributed 40-core pachi engine running overnight
after the last night KGS tournament and reserved it for few high-dan
players in the evening. Pachi was third in the 9x9 tournament, this
might give some perspective on the level of the games played among
the top programs:
rank wins-losses
8d 4-0
7d 1-2
6d 5-3
3d 7-1
2d 4-3
AGA 3d 9-2 odnihs[-] declares himself as AGA 3d
vsbots 0-1 guest account
(no losses against other players)
http://www.gokgs.com/gameArchives.jsp?user=pachi
* During the night, I attempted to fix misbehaving resign code to make
the program more human-friendly; in the process, I introduced another
bug that would make pachi resign in some won scoring positions - so in
the game list, many losses were actually won games where Done instead
of Resign would produce a positive score.
** In the Computer Go tournament, time was 4:00+25/1:00. For the first
two games against famine 8d, time was 9:00+25/1:00, then it was changed
to 9:00+3x0:20. After the game with miracle 6d, it was changed to
6:00+3x0:10 and the challenge was opened to general public.
The most spectacular game was perhaps the ko fight in:
http://files.gokgs.com/games/2010/9/5/michi2009-pachi.sgf
The games show that computers can play at fairly high level even on
fairly small clusters, successfully beating even high dans in very
advanced fights, however especially in the lower-dan games, it confirms
that systematic errors still haunt them and they simply always get
various specific situations wrong.
(Also, opening book is essential for current-level 9x9 programs. Pachi
does not have one and I think the performance suffers a lot because of
that. I think at least 6 of the 12 losses could be prevented - or at
least a less obviously bad variation chosen - by even a minimalistic
opening book. Three of the losses resulted from exactly the same
resign-in-30-moves sequence played by Pachi repeatedly.)
--
Petr "Pasky" Baudis
The true meaning of life is to plant a tree under whose shade
you will never sit.
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