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Re: [computer-go] Third KGS tournament: game-end protocol

From: Gunnar Farnebäck <gunnar@xxxxxxxxxxxxxxxxx>
Reply-To: computer-go <computer-go@xxxxxxxxxxxxxxxxx>
To: computer-go <computer-go@xxxxxxxxxxxxxxxxx>
Subject: Re: [computer-go] Third KGS tournament: game-end protocol Date: Fri, 10 Jun 2005 00:33:30 +0200

steve uurtamo wrote:
> um, this won't make you lose points in chinese
> rules. which, i'm guessing, is part of the reason
> that these tournaments use them.
indeed


Sometimes it won't, sometimes you will lose a lot. Consider what
happens if there's a seki on the board, or if you (X) happen to play
the liberties in the wrong order in this position:

|XXXX..
|OOOXXX
|O.OOOX
|XXX.OX
+------

It's still alternating play, so O won't sit passive if a chance to
live unexpectedly appears.

And of course, in the case of a bent four in the corner you really
have to know what you're doing.
Sure, but you really should know what you're doing if you expect to win a Go game!

I'll stand by my original assertion that it isn't overly hard to make a program kill stones at the end of the game. I'm not talking about using some totally trivial algorithm (although it may be possible, I don't know), I'm talking about tweaking an existing Go program to kill stones if required. After all, killing stones is actually part of playing Go so an existing program just needs a little encouragement to finish the job.

If the program is weak, then it may have some trouble with seki or bent four but I don't see that as a big issue. And the common case of surrounding and capturing groups of dead stones is rather straight forward in my experience.

regards,
Peter

/Gunnar
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