| format | 20-round Swiss |
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| board size | 9×9 |
| rules | Chinese |
| komi | 7 |
| time | 9 minutes plus 10/30s |
The first round started at 16:00 UTC.
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In the table above, The numbers in the table do not add up as you might expect. This is because two entrants, not listed above, were removed after two rounds. | |
Twelve players entered. These included break9, and it was present on KGS earlier in the day, so I registered it. However it disappeared from KGS before play started, and had not reappeared by midway through round 2. Therefore I removed it from the tournament; and to keep the numbers even and avoid byes, I also removed WeakBot50k. This left the ten players shown in the cross-table above.
In round 1, StoneGrid obtained a won position against CzechBot, but then stopped moving, and lost on time. It continued to play throughout the tournament, but never made any more moves, and so lost all its games. I twice "kicked" it from the server, in the hope of waking it up; each time it reconnected after five minutes, but still did not move. Its author John Fan later emailed me "It seems the StoneGrid got stuck into an infinite loop in the first game. I thought I had fixed it but it is still there. It does not occur often, but obviously when it occurs, it is a quite serious issue. And I am sorry for the inconvenience it had caused".
In round 8, CzechBot outplayed SimpleBot, and could easily have won by 48 points. However it preferred to suicide its group in a seki, and win by 2 points.
After round 8, all the players were on different scores: Zen9 8, pachi2 7, ManyFaces2 6, AyaMC 5, CzechBot 4, Orego12 3½, oakfoam 3, PNUGo 23½, SimpleBot 1, StoneGrid 0.
Round 9 gave Zen9 its first non-win: a jigo against pachi2.
In round 10 Zen9 and pachi2 played again. (The pairing algorithm sometimes appears eccentric, but I, at least, am very pleased with the way it operates. It chooses the pairings which will be most informative about how the players rate against each other.) This time, pachi2 won.
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| Many Faces of Go vs Zen9 |
| Moves 31-44 |
In round 18, Many Faces of Go and Zen9 played an interesting game. The final 14 moves are shown in the diagram to the right. After move 44, Zen9 resigned, it has lost the semai on the right side.
I should probably not comment, as I am considerably weaker than either of the players – but my impression is that move 31 was unnecessary. If instead Zen9 had played to connect on the right edge (between 32 and 35), Many Faces could have pushed at 31, starting a semeai between the two groups on the top edge, but I think Zen9 would have won this semeai.
Players receive points for the 2011 Annual KGS Bot Championship as follows:
| Zen | 8 |
| pachi | 5 |
| Many Faces of Go | 3 |
| Aya | 2 |
| MoGo | 1 |