| format | 8-round Swiss |
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| board size | 19×19 |
| rules | Chinese |
| komi | 7½ |
| time | 29 minutes plus 10/30s |
The first round started at 08:00 UTC.
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Twelve players registered. We welcomed one new player, GoKnot-isGo, by Jacques Basaldúa. GoKnot-isGo, whose KGS username is GoKnot, is derived from his older engine, QYZ. It is based on MC with MoGo-style patterns, RAVE, progressive widening, and a new version of M-eval.
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| Zen19 vs pachi2 |
| Moves 169-173 |
In round 1, Zen19 and pachi2 payed the sequence shown to the right. If I saw two humans of my own stregth play like this, I would assume that White had "missed" the snap-back set up by move 171. But move 170 is large: it is possible, for all I can tell, that the whole sequence was sensible.
Zen19 (White) eventually won this game.
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| Orego12 vs CzechBot |
| Moves 46, 47 |
In round 5 CzechBot, as Black, extended as shown to the left, and was blocked by Orego12. My impression is that the block is obvious, and that the exchange of 47 for 48 is clearly bad for Black. Quite weak human players use a tree-pruning heuristic "if an exchange leaves me in a worse position than before, then don't play it".
Also in round 5, GoKnot achieved a won position against WeakBot50k, and after two passes the players failed to agree on the status of some stones. In the clean-up phase, GoKnot did nothing for two minutes, then woke up and played fast to win the game.
Meannwhile StoneGrid and PNUGo both got into overtime, and played slowly enough to delay the start of round six by three minutes. Fortunately, the KGS tournament scheduler handles this correctly, starting a new round as soon as the scheduled time has been reached and all the games from the previous round are over.
In round 8, CzechBot got a won position against WeakBot50k, but then, with 3 seconds of main time left on its clock, started passing, allowing its opponent to capture some of its groups, and lost the game. It acted as if it was unaware of the overtime. It did exactly the same against WeakBot50k in the May KGS bot tournament.
Also in round 8 pachi2 was again drawn against Zen19, and again lost. This was the only repeat pairing of the tournament. It was unfortunate for pachi2: Zen beat pachi2 (twice) and ManyFaces1, and pachi2 beats ManyFaces1, but ManyFaces1 came above pachi2 in the final list, thanks to the SoDOS tiebreak. (The SoDOS difference was a consequence of pachi2's first-round loss to Zen, which caused it to be drawn against weak opponents in rounds 2 and 3.)
Players receive points for the 2011 Annual KGS Bot Championship as follows:
| Zen | 8 |
| Many Faces of Go | 4 |
| pachi | 4 |
| MoGo | 2 |
| Aya | 1 |