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Re: [gnugo-devel] avoid .sgf problem

From: Gunnar Farnebäck
Subject: Re: [gnugo-devel] avoid .sgf problem
Date: Sat, 21 Aug 2004 02:44:37 +0200
User-agent: EMH/1.14.1 SEMI/1.14.3 (Ushinoya) FLIM/1.14.2 (Yagi-Nishiguchi) APEL/10.3 Emacs/21.3 (sparc-sun-solaris2.9) MULE/5.0 (SAKAKI)

Arend wrote:
> Handicap stones should be set up with AB[]. If gnugo detects a game with
> handicap, but no AB[]'s, it adds them (after the first move).
> KGS uses B[] instead of AB[] in case of free handicap placement. This may
> not be according to the letter of the sgf-specification, but I think it is
> correct according to its spirit -- AB[] is for preset stones (starting 
> position
> of a problem, handicap stones), B[] is for moves that are an actual decision
> by one of the players.

I don't agree, I think it's more appropriate to use AB[] also for free
handicap placement.

> In fact, it seems to me that the text in the description of the HA[]
> property was only thinking about fixed handicap.


> I suggest to avoid this issue by only manually adding the handicap stones
> if we detect a _white_ move on the empty board in a handicap game.

Well, the manual addition is really only a workaround to handle old
sgf files, in particular ones written by ancient versions of GNU Go,
where the handicap stones are not explicitly listed. I don't think
this is much needed any longer. On the other hand your workaround to
the workaround looks quite solid, so it would be fine with me.


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