Ninety-third KGS Computer Go Tournament

Sunday June 2nd, 2013

These results also appear on an official KGS page.

Rules

format21-round Swiss
board size9×9
rulesChinese
komi7
time9 minutes plus 10/30s

Times

The first round started at 08:00 UTC.

Result table


PlaceNamecross-tableWinsSOSSoDOSNotes
Zen19 AyaMC ManyF NiceG Orego gnugo
1Zen19S
X
W12R B17R W0122 B115R W118R B121R W13R B1612 W11112 B11412 W11920 W11R B18R W113R B116R B1574 W19R B117R B14R W11022 B12030 20204191Winner
2AyaMC B02R W07R B1122 W015R B018R W021R
X
B04R W010R B013R W1166 B1172 B15R W16R B111R W119R B13R W18R B120R W116 B194 W1144 13246107
3ManyFaces1 B03R W0612 B01112 W01412 B01920 W14R B110R W113R B0166 W0172
X
W12R B094 W118R B120R W11R B17R W112R W1548 B1820 W11514 B12136 13228½92½
4NiceGo19N B01R W08R B013R W016R W05R B06R W011R B019R B02R W194 B018R W020R
X
B14R W110R B114R W115R B121R W131 B176 W1122 B117R 10216½45½
5Orego60 W0574 B09R W017R W03R B08R W020R B01R W07R B012R W04R B010R W014R B015R W021R
X
B122 W1616 B1114 W01374 B016R J18 B1192 20510
6gnugo3pt8 W04R B01022 W02030 B016 W094 B0144 B0548 W0820 B01514 W02136 B031 W076 B0122 W017R W022 B0616 W0114 B11374 W116R J18 W0192
X
222½9

Black won 32 games, White won 30 games, and there was 1 jigo.

Results

NiceGo19N vs gnugo3pt8
After both players passed

In round 3, NiceGo19N and gnugo3pt8 both passed in the position shown to the right. They were right to pass, the game is over, and White is 16 points ahead. However they disagreed about the status of the dead groups, entered the clean-up phase, and both passed again. So the game was counted with all the stones treated as alive: White won by 1 point. This surprised me. In the past I have seen GNU Go handle the clean-up phase correctly.

gnugo3pt8 vs NiceGo19N
After both players passed

In round 7, gnugo3pt8 and NiceGo19N both passed in the position shown to the left. They were right to pass, the game is over, and Black is 14 points ahead. However they disagreed about the status of the dead groups, entered the clean-up phase, and both passed again. So the game was counted with all the stones treated as alive: Black won by 6 points.


Zen19S vs AyaMC
Moves 1-18

In round 12, Zen19S lost its only game of the tournament, to AyaMC. The start of the game is shown to the right. Zen19S's operator Hideki Kato commented "The opening was, I guess, good for Aya.   E7 (18th move) looks [like an] overplay".


NiceGo19N vs gnugo3pt8
After both players passed

Also in round 12, NiceGo19N and gnugo3pt8 played a game which ended, after scoring, as shown in the diagram to the left. This time, they have marked the dead stones correctly, and there is no problem with their behaviour or the result. However the diagram, copied directly from KGS, shows a ko restriction on B9. When I noticed this, I thought, "that's wrong, a ko resriction cannot still be in place after the game is over". But on reflection, I think it is correct. Of course it normally doesn't matter, after consecutive passes no more moves are made, so a ko restriction is irrelevant. But if a game enters the clean-up phase it might matter. And the superko rule implemented on KGS is "a player may not play a stone so as to create a previous board which existed previously in the game."
      So, I believe, Black is forbidden to play at B9 in the position shown, and the server is right to show a black square (indicating a ko or superko restriction) in the diagram that shows the results of scoring.


Annual points

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

Zen8
Aya4
Many Faces of Go4
oakfoam2
Orego1


Details of processor numbers, power, etc.

AyaMC
Aya, MC version, running on 980X 3.3GHz 6 cores
ManyFaces1
Many Faces of Go, running on an Amazon EC2 Cluster Compute Eight Extra Large Instance, 2 x Intel Xeon E5-2670, using 16 cores, 16 threads, and 48 GB of memory.
NiceGo19N
oakfoam, running on i7-2600K
gnugo3pt8
GNU Go version 3.8, running at its "level 19", with Monte-Carlo enabled, on a single 3.3GHz Intel i5-2500 CPU.
Orego60
Orego, running on five nodes of our custom Linux cluster Fido. The node has two AMD Six Core Opteron 2427 2.2 GHz processors (60 cores total), 8 GB RAM, Centos Linux.
Zen19S
Zen, running on a mini-cluster of a dual 6-core Xeon X5680@4 GHz 24GB 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 a GbE LAN. 30 cores total.

13-06-02 12:17 gghideki Room 354 The opening was, I guess, good for Aya. 13-06-02 12:21 gghideki Room 354 E7 (18th move) looks overplay RayTomes [1d]: g2 wins