Re: [computer-go] 2nd KGS Computer Go Tournament

[Gunnar Farnebäck <gunnar@xxxxxxxxxxxxxx>]

Nick wrote:
> I have only once had to deal with a situation where an unsettled group 
> was left on the board at the end of a computer/computer game.  This was 
> the game Aya (the same Aya that won the recent KGS event) versus Indigo, 
> in the MSO, London, 2000.  The unsettled 78-stone group belonged to 
> Indigo, and Indigo's owner conceded (as was evident from the play) that 
> Indigo thought it was dead.

and, in another message:
> Or, we may be referring to "real" disputes, where the true status of a 
> group is difficult (for a 20-kyu) to assess, and after both bots have 
> passed, there is a genuine disagreement about the status of a group. 
> Now I have never heard of this happening.  Bots tend to defend their 
> groups that might be weak, and to attack their opponent's groups that 
> might be weak, and one way or another the situation gets resolved.  Even 
> with Japanese rules in force I have never heard of a "real" dispute 
> happening;  with the Chinese rules that we use for KGS bot tournaments, 
> it is far less likely.

The GNU Go versus Indigo game from the 2004 Computer Olympiad might
qualify as a real dispute. The white group in the lower left corner
changed status from dead to unsettled when GNU Go filled a liberty
with the very last move. GNU Go thought it was still dead and would
have won the game if it had been scored as dead. I don't know what
Indigo thought but the jury decided to give the win to Indigo. See
http://computer-go.org/pipermail/computer-go/2005-January/002508.html
for more information about the game, including the game record.

Notice that this game was played under Chinese rules. For this reason
I have run GNU with the --play-out-aftermath option in the recent KGS
tournaments. While this doesn't actually remove all dead stones it
does eliminate any uncertainty about their status. It also causes
comments like "Doesn't this stupid bot know that those stones are
dead?" or "Why is it wasting moves cutting apart the dead stones?"

/Gunnar
_______________________________________________
computer-go mailing list
computer-go@xxxxxxxxxxxxxxxxx
http://www.computer-go.org/mailman/listinfo/computer-go/