|time||9 minutes plus 10/30s|
The first round started at 08:00 UTC.
Black won 32 games, White won 30 games, and there was 1 jigo.
In round 3, NiceGo19N and gnugo3pt8 both passed in the position shown to the right. They were right to pass, the game is over, and White is 16 points ahead. However they disagreed about the status of the dead groups, entered the clean-up phase, and both passed again. So the game was counted with all the stones treated as alive: White won by 1 point. This surprised me. In the past I have seen GNU Go handle the clean-up phase correctly.
In round 7, gnugo3pt8 and NiceGo19N both passed in the position shown to the left. They were right to pass, the game is over, and Black is 14 points ahead. However they disagreed about the status of the dead groups, entered the clean-up phase, and both passed again. So the game was counted with all the stones treated as alive: Black won by 6 points.
In round 12, Zen19S lost its only game of the tournament, to AyaMC. The start of the game is shown to the right. Zen19S's operator Hideki Kato commented "The opening was, I guess, good for Aya. E7 (18th move) looks [like an] overplay".
Also in round 12, NiceGo19N and gnugo3pt8 played a game which ended, after scoring, as
shown in the diagram to the left. This time, they have marked the dead stones correctly,
and there is no problem with their behaviour or the result. However the diagram, copied
directly from KGS, shows a ko restriction on B9. When I noticed this, I thought, "that's
wrong, a ko resriction cannot still be in place after the game is over". But on reflection,
I think it is correct. Of course it normally doesn't matter, after consecutive passes no
more moves are made, so a ko restriction is irrelevant. But if a game enters the clean-up
phase it might matter. And the superko rule implemented on KGS is "a player may not play
a stone so as to create a previous board which existed previously in the game."
Players receive points for the 2013 Annual KGS Bot Championship as follows: