[Computer-go] John is Tromp in Game 1

[steve uurtamo]

there's a great thing to exploit: the exploration factor explodes
because of the options.

same reason (i'm guessing) that two or three interrelated semeais can
lead to exploratory disaster -- too much to deal with.

s.

On Sat, Jan 14, 2012 at 1:35 PM, David Fotland <fotland at smart-games.com> wrote:
> 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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