[Computer-go] John is Tromp in Game 1

[steve uurtamo]

or i suppose more simply: two hard kos with plenty of threats.

s.

On Sat, Jan 14, 2012 at 1:38 PM, steve uurtamo <uurtamo at gmail.com> wrote:
> 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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