Sixty-ninth KGS Computer Go Tournament

Sunday March 6th 2011

These results also appear on an official KGS page which links to the records of all the games.


format10-round Swiss
board size13×13
time19 minutes plus 10/30s


The first round started at 16:00 UTC.

Result table

Zen13 pachi ManyF Erica Stone AyaMC gomor Czech coldm Orego PNUGo break Simpl WeakB
B12R W010R B14R B17R W15R W11R W13R B16R W18R W1930½ 96052Winner
2pachi2 W02R B110R
B15R B06R W17R W14R B13R W11R B19R W18½ 86044
3ManyFaces1 W04R W05R
W13R B110R W12R W16R B09R W18R W17R B1165½ 76139
4Erica13 W07R W16R B03R W010R
B19R B15R W11R W14R B18R W1242½ 75835
5StoneGrid B05R B07R B02R
W16R W110R W13R W14R W11 B1924½ B1847½ 75026
6AyaMC B01R B06R W09R
W110R B02R B15R B13 B14T W1718½ W1818½ 64417
7gomorra3 B03R B04R W19R W05R B06R B010R
W11R B1817½ W12F B1721½ 55316
8CzechBot W06R W03R B08R B01R B010R
W19R W17R W15½ B1427½ W1262½ 55113
9coldmilk B08R B01R B07R B04R B03R W12R B09R
B1611½ W11062½ B1533½ 45411
10Orego12 W09R W08R B04R W05R B01R B07R
B110 W12 B1311½ W16 4468
11PNUGo B0930½ B08½ B0242½ B01 W03 B05½ W010
W1766½ B16161½ B14123½ 3515
12break13 W0165½ W0924½ W04T W0817½ W0611½ B02 B0766½
W1520½ B1313½ W11028½ 3382
13SimpleBot W0847½ B0718½ B02F W0427½ B01062½ W0311½ W06161½ B0520½
B11161½ W19176½ 2370
14WeakBot50k B0818½ W0721½ B0262½ W0533½ B06 W04123½ W0313½ B01028½ W01161½ B09176½

Fifteen players registered. IdiotBot was removed before the start of round 1, to make the numbers even.


In round 2, gomorra3 and SimpleBot both passed, and then failed to agree on which stones were dead. Nothing further happened. The game was a clear win for gomorra3, so I assigned it the win. I then killed the game (if I assign a win and don't kll the game, the players remain in it and don't join their game in the next round).

CzechBot vs pachi2
Move 80.

In round 3, gomorra3 joined its game with Zen13, but did not make a move. I alerted its owner, who was able to restart it, but with less than four minutes left on its clock. It lost to Zen13.

Also in round 3, CzechBot made the move shown to the right. I assume this is another example of an MC program playing a forcing move when no move has a significant chance of winning, something I have mentioned in previous reports.

After round 3, Zen13 and ManyFaces1 were the only players on three wins.

In round 4, Zen13 beat ManyFaces1. Break stopped moving late in its game with AyaMC, after all its stones were dead, and lost on time.

In round 6 break13 and coldmilk had a problem in the clean-up phase. Break13 marked its one-liberty group as alive, coldmilk accepted this and won anyway.

EricaBot vs Zen13
Moves 1-26

In round 7, Zen13 as Black made some unreasonable-looking contact plays against EricaBot, as seen to the left. User "gogonuts [5d]" (Stefan Kaitschick) commented "having those attachments turn out badly satisfies my sense of justice", and later "Erica deserved to win against zen. Played best against the attachment overplays, but then zen fought erica down".

After round 7 Zen13 was on seven wins, two wins ahead of the next player.

CzechBot vs coldmilk
Moves 137 & 138

In round 9 CzechBot, as Black, had a close game against coldmilk, when it failed to protect against a ko. As soon as coldmilk started the ko, as shown to the right, CzechBot resigned. It is posible that it was "aware" of the ko but needed the extra point on the right edge to be ahead.

In round 9 pachi2 beat Zen13. This was Zen13's only loss of the tournament, but it was still the clear winner.

Players receive points for the 2011 Annual KGS Bot Championship as follows:

Many Faces of Go2


Details of processor numbers, power, etc.

Aya, running on 6 cores of an i980X 3.3GHz
break, probably running on a single processor Intel(R) Celeron(R), 1.7Ghz
coldmilk, running on a 12-core Xeon, 2.26GHz
MoGo, running on an 8-thread i7 920, 6GiB RAM
Erica, running on an i7-950, 4 cores processor of 3.07 GHz.
Gomorra, running on a cluster of 4 nodes with 12 cores each, thus 48 cores. Cores are running at 2.67 Ghz. Nodes are connected through 4xSDR InfiniBand.
Many Faces of Go, running on 12 cores.
Orego, running on one of the five nodes of a custom Linux cluster build by PSSC Labs: the node has two AMD Six Core Dual Opteron 2427 2.2 GHz (12 cores total), 8 GB RAM, Centos Linux.
pachi, running on 64 unspecified 20-core platforms.
GNU Go, running on a 2-core system, probably a Core2 Duo E7200 2.53GHz
running on Linux, 8GiB RAM, AMD Athlon(tm) 64 X2 Dual Core Processor 4000+
StoneGrid, running on an Intel Core2 Quad Q9400 (2.66GHz, 6MB L2, 1333Mhz FSB)
running on Linux, 2GiB RAM, Intel(R) Celeron(R) M CPU 530 @ 1.73GHz
Zen, running on a Mac Pro 8 core, Xeon 2.26GHz