[Computer-go] John is Tromp in Game 1

[David Fotland]

I had the same problem with Many Faces until recently, and I think Aja fixed it in Erica also.  The symptom is pretty clear: an important ko appears and the program starts playing ko threats rather than starting the ko.

David

> -----Original Message-----
> From: computer-go-bounces at dvandva.org [mailto:computer-go-
> bounces at dvandva.org] On Behalf Of steve uurtamo
> Sent: Saturday, January 14, 2012 1:27 PM
> To: computer-go at dvandva.org
> Subject: Re: [Computer-go] John is Tromp in Game 1
> 
> i'd be surprised if the ko threats had more utility for mcts than as
> potential chances for winning due to mistake. i.e. if you have 50 ko
> threats, they all look like (especially after digging into the tree)
> ways to win due to mistake.
> 
> s.
> 
> On Sat, Jan 14, 2012 at 1:24 PM, David Fotland <fotland at smart-games.com>
> wrote:
> > Around move 121, it looks like Zen has the common MCTS problem that it
> plays the ko threats before starting the ko. �Ko threats are essential for
> wining, so RAVE gives them very high biases.
> >
> > David
> >
> >> -----Original Message-----
> >> From: computer-go-bounces at dvandva.org [mailto:computer-go-
> >> bounces at dvandva.org] On Behalf Of "Ingo Alth�fer"
> >> Sent: Saturday, January 14, 2012 12:16 AM
> >> To: computer-go at dvandva.org
> >> Subject: [Computer-go] John is Tromp in Game 1
> >>
> >> Hello,
> >> John Tromp got the white stones and his been winning
> >> game 1 of the slow-time match aagainst Zen on KGS.
> >>
> >> The sgf, including chat, you can download here:
> >> www.althofer.de/tromp-zen-01.sgf
> >>
> >> I let ManyFaces run across the game and got the following two figures.
> >> Monte-Carlo percents:
> >> http://www.althofer.de/tromp-zen-01-percents.jpg
> >> Expected Territory:
> >> http://www.althofer.de/tromp-zen-01-territory.jpg
> >>
> >> Around move 118-120 experts were still undecided about the possible
> outcome.
> >> According to ManyFaces, the game may have turned to John's favour around
> >> move 130. At move 146 Hideki said that Zen had still 37 % "self-
> confidence".
> >>
> >> Ingo.
> >>
> >> --
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