Hundred and thirteenth KGS Computer Go Tournament

Sunday June 14th, 2015

These results also appear on an official KGS page.


format36-round Swiss
board size9×9
time4 minutes plus 10/30s


The first round started at 08:00 UTC.

Result table

Zen19 Crazy DolBa AyaMC abaku NiceG Orego gnugo
W016 B18R W113R B121R W122R B129R W134R J5 B092 W1112 B0162 W1202 B1252 W035R W17R B110R W114R J23 W0244 B0282 J30 B136R B16R W115R B119R W127R B132R W13R B112R W126R W14R B118R W131R B1224 W11758 B13326 28½700489½Winner
2CrazyStone B116 W08R B013R W021R B022R W029R B034R
J3 W14R B1102 W1146 B1174 W1312 B136T B15R W111R B115R W025R B027R W132R B12R W112R B118R W123R B133R W135R W16R B116R W124R B130R B19R W119R B126R W176 B1202 W1286 27½695455½
3DolBaram J5 W192 B0112 W1162 B0202 W0252 B135R J3 B04R W0102 B0146 W0174 B0312 W036T
W12R J18 W121R B0292 W134R W17R B113R W0244 B128R W18R B119R W127R B132R W133R B16R W115R B123R W130R B1122 W11228 B12244 W12666 23½685315
4AyaMC B07R W010R B014R J23 B1244 W1282 J30 W036R W05R B011R W015R B125R W127R B032R B02R J18 B021R W1292 B034R
W13R B18R W120R B026R B14R W19R B117R W122R B135R W11R B112R W116R B133R W1616 B1138 W1194 B1314 22½690½297½
5abakus W06R B015R W019R B027R W032R W02R B012R W018R B023R W033R B035R B07R W013R B1244 W028R B03R W08R B020R W126R
B11R W111R B114R W121R B131R B15R W110R B117R W122R B129R W134R B146 W1922 B1166 W1252 B1302 W1366 19616½171
6NiceGo19N B03R W012R B026R B06R W016R B024R W030R B08R W019R B027R W032R B033R W04R B09R W017R B022R W035R W01R B011R W014R B021R W031R
B12R W17R B013R W120R B125R W128R B136R B1512 W1102 B1154 W1182 B1236 W1292 B13420 13590½64
7Orego32 B04R W018R B031R W09R B019R W026R W06R B015R W023R B030R B01R W012R B016R W033R W05R B010R W017R B022R W029R B034R W02R B07R W113R B020R W025R B028R W036R
W134 B08R W011R B1142 W021R B024R W1276 B1322 W1352 659333
8gnugo3pt8 W0224 B01758 W03326 B076 W0202 B0286 W0122 B01228 W02244 B02666 B0616 W0138 B0194 W0314 W046 B0922 W0166 B0252 W0302 B0366 W0512 B0102 W0154 B0182 W0236 B0292 W03420 B034 W18R B111R W0142 B121R W124R B0276 W0322 B0352

This table does not display correctly with Chrome, it is shown without its final column. It displays correctly with Firefox, Internet Explorer, Opera, and Safari.

Black won 67 games, White won 72, and there were 5 jigoes.


We welcomed a new player to these events, abakus, by German programmer Tobias Graf. Graf was a contributor to Gomorra, the MC-based Go program of Lars Schäfers which was active from 2010 to 2013.

Seven players registered. I therefore added GNU Go, to make the numbers even.


I cannot make helpful comments on the play, as the players are so much stronger than me. I did think I had found a questionable move in one game, but careful analysis shows me that I was wrong.

Number of Jigoes

The 144 games resulted in 67 black wins, 72 white wins, and 5 jigoes. This balance between black and white wins suggests that the use of 7 for the komi is probably correct. But what I want to discuss here is the proportion of jigoes.

Assuming no odd sekis, there are I think 69 possible score differences on the board at the end of game, with +81 and -81 being the most likely. So, the probability that a game between very weak players ends in jigo is rather less than 1/69, maybe about 1/80, and from 144 games we should expect about two jigoes. With perfect players, and assuming that komi of 7 is in fact correct, we should expect 144 jigoes from 144 games. So, the five jigoes we observed weakly suggests that these player are better than random, and convincingly shows that they are a very long way short of perfect at 9×9 Go.

We can use the proportion of jigoes in the results as a measure of closeness of the players to perfect play. It has a long way to rise, but I anticipate the proportion of jigoes in 9×9 Go will rise steadily over the next few years. In fact, if we consider only the games from this tournament in which both players finished in the top half of the results table, we find five jigoes from forty games, which is encouraging.

Annual points

Players receive points for the 2015 Annual KGS Bot Championship as follows:

Crazy Stone5

Details of processor numbers, power, etc.

abakus, running on 5 nodes each with two Intel Xeon E5-2670, 2.6GHz and 64 GByte main memory (80 cores total)..
Aya, MC version, running on an 980X 3.3GHz, 6 cores.
Crazy Stone, running on Amazon ec2 c4.8xlarge server instance (xeon, 18 cores, 36 threads, 2.9GHz).
DolBaram, running on a dual Xeon-X5660, 12 cores at 2.8GHz for rounds 1 to 3, and Amazon C3.8xLarge (2.8GHz * 16core) for rounds 4 to 12.
GNU Go, version 3.8, running one thread on one i5-5200 CPU.
oakfoam, running on an i7-4790K / GTX-970.
Orego, running on an instance in the Google Compute Engine cloud (type n1-highcpu-32, which has "32 virtual CPUs and 28.8 GB of memory".) The machine runs Centos 7.
Zen, running on a dual 10-core Xeon E5-2690 v2@3 GHz 32 GB RAM.