Eighty-fifth KGS Computer Go Tournament

Sunday August 12th, 2012

These results also appear on an official KGS page.


format30-round Swiss
board size9×9
time4 minutes plus 10/30s


The first round started at 16:00 UTC.

Result table

Zen19 stv AyaMC pachi NiceG Orego
B1328 W15R J9 W111R B0162 W018R B122R W026R B130R W11R B17R W112R B115R W121R B127R B14R W110R B114R W120R J24 W125R B129R W16R B18R W117R B123R W128R W12R B113R W119R 26441½341½Winner
2stv W0328 B05R J9 B011R W1162 B118R W022R B126R W030R
B14R W110R B117R W119R B020R W124R B128R W11R B18R W113R B023R W127R W12R B17R W114R B121R W129R W16R B012R W115R B125R 21½473284
3AyaMC B01R W07R B012R W015R B021R W027R W04R B010R W017R B019R W120R B024R W028R
B12R W16R B116R W118R B022R W13R B111R W113R B025R W130R W15R J8 W19R B114R W123R B126R W129R 15½449½137½
4pachi W04R B010R W014R B020R J24 B025R W029R B01R W08R B013R W123R B027R W02R B06R W016R B018R W122R
B15R W19R B012R W115R B119R W126R W13R B17R W111R B117R W121R J28 W130R 14448½106
5NiceGo19N B06R W08R B017R W023R B028R B02R W07R B014R W021R B029R B03R W011R B013R W125R B030R W05R B09R W112R B015R W019R B026R
B11R W14R B110R W016R J18 W120R J22 W124R B127R 943553½
6Orego12 B02R W013R B019R B06R W112R B015R W025R B05R J8 B09R W014R B023R W026R B029R B03R W07R B011R W017R B021R J28 B030R W01R B04R W010R B116R J18 B020R J22 B024R W027R

In the table above,
   0 is a loss
   1 is a win
   J is jigo
   left superscript is the player's colour
   right superscript is the round in which the game was played
   a subscript shows how the result was determined:
      R for resignation
      T for time
      F for forfeit
      a number for the points difference after counting.
All the 0s, 1s and Js are links to the game record.


I have nothing to say about the play in this event. Most of the players are much stronger than me, and I noticed no poor moves.

All of the players played in all of their games, without mishap. I thunk this is unusual for these events, and I congratulate the programmers.

Pachi's programmer detected a bug, which probably had a serious effect on its play. He fixed this in time for rounds 22-30.

The 90 games yielded 52 White wins, 32 Black wins, and 6 jigoes. This is "significant at the 5% level". It helps to convince me that, for 9×9 Go with Chinese rules, 7 points komi is more appropriate than 7½ points komi (and 6½ might be better still).

Annual points

Players receive points for the 2012 Annual KGS Bot Championship as follows:


Details of processor numbers, power, etc.

Aya, running on 6 cores of an i980X, at 3.3GHz.
oakfoam, running on an i7-2600K.
Orego, runing on one node of a custom Linux cluster. The node has two AMD Six Core Dual Opteron 2427 2.2 GHz (12 cores total), 8 GB RAM, Centos Linux.
pachi, running on 4 cores i7-920.
SteenVreter, running on an Opteron system with 46 threads at 2.2 Ghz.
Zen, running on a mini computer cluster consisting of a dual 6-core Xeon X5680@4.2 GHz 24 GB RAM, a 6-core i7 3930K@4.2 GHz 16 GB RAM, a 6-core Xeon W3680@4 GHz12 GB RAM, and a 6-core i7 980X@4 GHz 6 GB RAM PCs connected via a GbELAN. 4 PCs (30 cores) total.