I attach the image of Zen's evaluation in the game. Look at the white groups at the top and top-left. Both of them are not 100% correctly evaluated. When this happens, Zen gets weaker because of the divergence and inaccuracy of Monte-Carlo simulations. I think it must be the current major problem of all MC programs.
Christian Nentwich wrote: >From a quick look, I would say the bots' evaluation in this case is entirely >correct. Zen was quite far ahead, and then made some bad endgame mistakes. >The trade around move 200 is particularly costly. Playing even a simple safe >move at 176 (like B10) would win the game without trouble. > >Christian > > >On 26 August 2010 10:01, Darren Cook <[email protected]> wrote: > >> > Tonight an interesting game was played in the >> > cellars of KGS: Zen19N vs Tromp. >> > (Zen is a bot, Tromp is John Tromp...) >> > >> > You can download the sgf from the KGS archives at >> > http://www.gokgs.com/gameArchives.jsp?user=tromp&year=2010&month=8 >> > >> > For a long time bots (Zen itself, Many Faces) believed >> > that White (=Zen) was clearly ahead. But around move 200 >> > the evaluations swung over, until Tromp won after move 271. >> >> Thanks Ingo. What are people's thoughts: were the programs mistaken in >> their optimism, or did Zen make a mistake in the middle game? >> >> Darren >> >> >> -- >> Darren Cook, Software Researcher/Developer >> >> http://dcook.org/gobet/ (Shodan Go Bet - who will win?) >> http://dcook.org/work/ (About me and my work) >> http://dcook.org/blogs.html (My blogs and articles) >> _______________________________________________ >> Computer-go mailing list >> [email protected] >> http://dvandva.org/cgi-bin/mailman/listinfo/computer-go >> >---- inline file >_______________________________________________ >Computer-go mailing list >[email protected] >http://dvandva.org/cgi-bin/mailman/listinfo/computer-go -- Yamato
<<attachment: ZenEval.png>>
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