| format | 32-round Swiss | |
|---|---|---|
| board size | 9×9 | |
| rules | Chinese | |
| komi | 7 | |
| time | 4 minutes plus 10/30s |
The first round started at 16:00 UTC.
Seven players registered for the tournament. I therefore added GNU Go, running on a single processor of my own desktop PC. I believe that having this play is better than having byes. GNU Go is so weak that it is unlikely to affect the result, but strong enough that it can win the occasional game.
At the start of round 1, Zen19S was not connected to KGS. Its operator was asleep, and his alarm clock had failed to ring. However he woke up later, and got Zen19S working in time to play in round 5. So Zen19S forfeited its games in the first four rounds.
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| Zen19S vs oakfoam |
| At game end |
In round 8, oakfoam and Zen19S both passed in the position shown to the right. Zen19S listed the dead groups correctly, but oakfoam claimed that its group in the bottom right was alive. I don't know whether it failed to understand that this "bent four in the corner" group can be killed, or whether it optimistically claims that all its stones are alive. (I wish KGS included these claims in the game record, rather than just the statement "Disagreement over tournament scoring. Switching to cleanup mode.") So the clean-up phase started, and oakfoam immediately resigned. In round 23 another game between Zen19S and oakfoam ended in the same way.
After 16 rounds, the scores were stv 11½, CrazyStone 11½, Zen19S 10½, ManyFaces1 8½, AyaMC 7½, Orego12 7½, oakfoam 5½, gnugo3pt8 1½. So it looked as if Zen19S might win, despite forfeiting its first four games.
In round 19, oakfoam and gnugo3pt8 failed to agree on the status of some groups at the end of the game, and so the clean-up phase started. Gnugo3pt8 passed instead of capturing any of oakfoam's dead groups, and so lost, in a won position. This surprised me. I had thought that GNU Go handled such situations correctly. I wonder if its "--monte-carlo" flag, which I had set for this event, somehow disables its handling of the clean-up phase. In round 30, another game between oakfoam and gnugo3pt8 ended in the same way.
In round 20, Zen19S beat CrazyStone by killing all its stones. This put Zen19S in the lead (on tie-break).
After 24 rounds, the scores were Zen19S 17½, CrazyStone 16, stv 15½, AyaMC 13½, ManyFaces1 13, Orego12 11, oakfoam 7½, gnugo3pt8 2.
After 28 rounds, the scores were CrazyStone 20, Zen19S 19½, stv 19½, AyaMC 16½, ManyFaces1 15, Orego12 11, oakfoam 8½, gnugo3pt8 2.
In round 32, Manyfaces1 joined its game with gnugo3pt8, but never made a move, and lost on time.
Also in round 32, Zen19S killed all Orego12's stones, but was disconnected by its operator before the game had formally ended. So Zen19S lost on time.
Players receive points for the 2013 Annual KGS Bot Championship as follows:
| Crazy Stone | 8 |
| Steenvreter | 5 |
| Zen | 3 |
| Aya | 2 |
| Many Faces of Go | 1 |