>-----Original Message-----
>From: [EMAIL PROTECTED]
>To: [email protected]
>Sent: Sun, 14 Jan 2007 11:08 PM
>Subject: Re: [computer-go] Fast Board implementation
>
>What should the mercy threshold be for other board sizes than 9 by 9,
>particularly 19 by 19?
>- George Dahl
I don't know.
For 9x9, I ran many random playout games and whenever the rule triggered I
would look at the board. With a little trial and error I picked a threshold
where, with just a quick glance, it was always obvious which side would win. I
use this threshold for external nodes and a higher one for internal nodes which
are more likely to have alot of dead stones.
Picking it this way is "the 80% solution." I got a nice speedup without
having to fuss with it and I don't need to constantly revisit the issue,
wondering if I'm running into some subtle bug.
- Dave Hillis
> >
> > Here are a few speedup tricks that have helped me.
> >
> > 1. The mercy rule. Since I'm incrementally keeping track of a list of empty
> > points, it's no real extra pain to keep track of the number of black and
> > white stones on the board. If the difference between them exceeds a
> > threshold, the game is over. Ending early has an added bonus that I know
> > the
> > outcome without needing to score the board. (You can shoot yourself in the
> > foot here. Best to pick a more conservative threshold the closer you are to
> > interior nodes of the tree.) For exterior nodes far from any interior
> > nodes,
> > I use a threshold of 25 stones.
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