| Formal division | |
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| format | 6-round Swiss |
| board size | 19×19 |
| rules | Chinese |
| komi | 7½ |
| time | 29 minutes plus 25/20s |
The first round started at 08:00 UTC.
Formal Division 13×13
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We welcomed a new entrant to these events: Yamato's 'Zen', playing as 'Zen19'. The details of Zen are secret, but Yamato (the pseudonym of an individual programer working in Japan) has revealed that it uses shape patterns generated by minorization-maximization (as Crazy Stone does), uses UCT, and does not use progressive widening. It contains a lot of hard-coded Go knowledge. It became known when it started playing on KGS on March 26th, and rapidly attained a 1-dan rating, running on a four-core system.
MoGo did not register, so Petr Baudiš registered his build of MoGo 'CzechBot' on the understanding that he would withdraw it if I received an official entry from MoGo.
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| Zen19 vs Fuego |
| Move 60. |
In round 2 Zen19, playing against valkyria19, started quite differently, making solid corner teritory. It won with little fighting. StoneGrid played out a long losing ladder agaisnt AyaMc, in an already lost position, and lost. CzechBot beat Fuego.
In Zen19's round 3 game against AyaMC, the first five moves looked normal,
but Zen19 then played on a 7-8 point. This provoked a fight, which Aya won. Zen19 then
used its outside stones to kill two of AyaMC's groups. AyaMC also had some successes,
but had to resign when it lost another group.
CzechBot and StoneGrid appeared to ignore each others' moves, CzechBot claiming rather
more than half the board and StoneGrid the rest. But StoneGrid proved better at
enlarging its half, and the game became close. The players failed to agree on the dead
stones (though there was nothing at all difficult), and after a tedious clean-up phase,
CzechBot won by 4½ points.
Fuego killed a group in an otherwise balanced game against valkyria19, causing it to resign.
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| AyaMC vs valkyria19 |
| Move 28. |
In its round 5 game with Zen19, StoneGrid disappeared for a while, but reconnected and resumed play. later it chased Zen19's stones in a ladder that did not work, and lost. Fuego made a large white moyo in its game with AyaMC, large enough to win the game. CzechBot won a fight at the top of the board, killing valkyria19's group, and valkyria19 resigned.
After five rounds, each entrant had played each other once, so it would have been a good time to end the tournament. CzechBot would have ben the winner, equal with Zen19 on wins and ahead on SoS, the first tiebreaker in KGS tournaments. However, the format of a KGS tournament has to be specified in advance, before the number of entrants is known, and I had specified six rounds. So one further round, round 6, was played. In this, the two leading players were paired for a second time. They played with the same colours (which seems to me to be a weakness on the pairing program, but not one serious enough to justify asking the programmer to fix). The game was the same as their round 4 game for the first eleven moves, with all the moves on the third and fourth lines. But in both games, CzechBot played move twelve near the centre, choosing a 9-9 point in round 4 and a 9-10 point in round 6, so the games then diverged. CzechBot won again, after a well-fought game.