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.
Yes, this one does look like a real dispute.