Ninety-fifth KGS Computer Go Tournament

Sunday August 25th, 2013

These results also appear on an official KGS page.


format24-round Swiss
board size13×13
time9 minutes plus 10/30s


The first round started at 08:00 UTC.

Result table

Zen19 AyaMC pachi coldm Orego gnugo
B11R W17R B111R W114R B118R W122R W12R B15R W110R B115R W119R B123R W13R B18R W113R B116R W120R W16R B19R W117R B124R W14 B11215½ W12162½ 24259259Winner
2AyaMC W01R B07R W011R B014R W018R B022R
W03R B112R W113R B116R W020R B14R W05R B110R W117R B123R W124R W12R B18R W121R W16 B19 W11528½ B119 15306123
3pachi B02R W05R B010R W015R B019R W023R B13R W012R B013R W016R B120R
W16R B09R W121R B14R W17R B111R W118R B122R B11 W18 B114 W11718½ B124 1429292
4coldmilk B03R W08R B013R W016R B020R W04R B15R W010R B017R W023R B024R B06R W19R B021R
W11R B112R W114R B115R W119R W12½ B17 W111½ B018R W122½ 1129267
5Orego12 B06R W09R B017R W024R B02R W08R B021R W04R B07R W011R B018R W022R B01R W012R B014R W015R B019R
B13 W15½ B110 W113½ B116 W020R B123 628012
6gnugo3pt8 B04 W01215½ B02162½ B06 W09 B01528½ W019 W01 B08 W014 B01718½ W024 B02½ W07 B011½ W118R B022½ W03 B05½ W010 B013½ W016 B120R W023

Black won 36 games and White won 36 games.

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.

Five players registered for the tournament. I therefore added GNU Go, running on a single processor of my own desktop PC. I believe that having it 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.


I have nothing to say about the actual play, as most of the players are stronger than me.

Zen19S won all 24 of its games. This is a most impressive achievement. Over this many games, we would expect at least a few upsets (as the results of gnugo3pt8 show); but Zen19S won all 24 of its games.

Annual points

Players receive points for the 2013 Annual KGS Bot Championship as follows:


Details of processor numbers, power, etc.

Aya, MC version, running on 980X 3.3GHz 6 cores
coldmilk, running on a 16-core Xeon, 2.9GHz
GNU Go version 3.8, running at its "level 17" on a single 3.3GHz Intel i5-2500 CPU. For rounds 1 to 3 it was accidentally configured to a lower level, so that it played too fast.
Orego, running one of the five nodes of a custom Linux cluster. The node has two AMD Six Core Dual Opteron 2427 2.2 GHz processors (12 cores total), 8 GB RAM, Centos Linux.
pachi, running on an AMD FX-8350 8 threads 16GiB RAM.
Zen, running on a mini cluster of a dual 6-core Xeon X5680@4 GHz 24 GB RAM, a 6-core i7 3930K@4 GHz 16 GB RAM, a 6-core Xeon W3680@4 GHz 12 GB RAM, and a 6-core i7 980X@4 GHz 6 GB RAM computers connected via aGbE LAN. 30 cores total.