# [Computer-go] Time policy

Gonçalo Mendes Ferreira gonmf at sapo.pt
Fri Nov 4 02:02:18 PDT 2016

```I similarly use C x (T / E) in matilda, with
C = 1.24
T = time left on current period (absolute or byo yomi)
E = argmax(estimate of game length divided by two ; 19) or byo yomi stones remaining

The length estimate ir around 2/3 of the board points.

It lacks the decision to expend a byo yomi period in more difficult positions.

Gonçalo FerreiraEm 04/11/2016 08:40, Urban Hafner <contact at urbanhafner.com> escreveu:
>
> I think there are some short papers about it out there. But I would suggest looking at the source code of existing bots like michi or pachi. What I use in my bot is really simple. I use the following formula:
>
> time for next move = remaining time / (C * max(vacant points, M))
>
> Where C is some constant you need to figure out (I use 0.5 right now), “vacant points” is the number of empty intersections on the board and M is a lower limit (I currently use 24) so that you don’t use up too much time that you might need when a capture happens.
>
> It has worked well enough so far that I haven’t looked at more intricate algorithms. Oh, and once I hit byo-yomi time I just divide the time into equal parts by the number of stones for the byo-yomi period.
>
> Urban
>
> On Fri, Nov 4, 2016 at 9:00 AM, Gian-Carlo Pascutto <gcp at sjeng.org> wrote:
>>
>> On 04-11-16 04:45, Billy White wrote:
>> > Hi,
>> >
>> > Our team is working on a computer go system mainly followed alphago.
>> > We try to add time policy to our system but cannot find something
>> > useful.
>> >
>> > I am wondering whether there are some useful material?
>>
>> Take a large games database, and construct a table of expected number of
>> moves remaining based on the current move of the game.
>>
>> Divide total amount of time left by the output of that table.
>>
>> Test if biasing it to think slightly longer early on helps playing strength.
>>
>> If there is byo-yomi time. the required extra thinking time generally
>> flows logically from the byo-yomi timecontrol and the above.
>>
>> --
>> GCP
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>
>
>
>
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