[Computer-go] public valid move generator algorithms?

[holger krekel]

Hi Petr,

On Sun, Mar 15, 2015 at 19:08 +0100, Petr Baudis wrote:
>   Hi!
> 
> On Sun, Mar 15, 2015 at 03:18:46PM +0000, holger krekel wrote:
> > could anyone point me to a current good public source algorithm
> > for generating valid moves from a given Go board position?
> > 
> > All else failing, i am going to analyze Gnugo first (board.c mostly)
> > but wanted to ask for hints here first.  I am mostly interested in
> > readability of the algorithm, not speed, at this point.  So high-level
> > language implementations are fine.
> 
>   Well, any open source Go program should be able to do the job,
> in principle.  But it's also a little unclear for me exactly what
> are you asking for.  In principle, the algorithm is
> 
> 	for point in board.empty_points():
> 		if board.play(point) is ok:
> 			# Not a suicide or ko violation
> 			yield point
> 
> ...but I guess you are asking for something more/else?

I am particularly interested in the implementation of the comment ("suicide").
It seems you need to track stone strings and their liberties to properly
determine if something is a suicide move.  Determining Ko-status is 
comparatively easy (superko or avoiding board repetetitions is a
different matter).

>   (If you are interested in Python, there are various Go implementations
> in it.  I'm working on https://github.com/pasky/michi/blob/master/michi.py)

thanks for the link!

holger

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