Eighty-sixth KGS Computer Go Tournament

Sunday October 7th, 2012

These results also appear on an official KGS page.


format15-round Swiss
board size13×13
time9 minutes plus 10/30s


The first round started at 16:00 UTC.

Result table

Zen19 ManyF pachi AyaMC Stone stv nomiB Orego gnugo MCark
W12R B010 W115R B13R W16R B17R W112R W15R B111R B14R W113R B18R W114R B11R W1922½ 14123113Winner
2ManyFaces1 B02R W110 B015R
W04R B112R W114R B15R W0715½ B013R W13R B19R B11R W16R W11134½ W18R 1012975
3pachi W03R B06R B14R W012R B014R
W11R W18R B09R B15R B17R W115R W111R B113R W12 B110R 1011963
4AyaMC W07R B012R W05R B01R
B04R W114R B115R B08R W111R B19R W110R W12R W16 B13R W113R 911147
5StoneGrid B05R W011R B1715½ W113R B08R W19R W14R B014R W015R
W02R B13R W012R B110R B1119½ B16R 812655
6stv W04R B013R B03R W09R W05R W18R B011R B12R
B06R W17R B114R B110 W115 B11R W112R 810935
7nomiBot W08R B014R W01R W07R B015R W09R B010R W03R B112R W16R
W14R B1549½ W113 W12R B111R 711329
8Orego12 W01R B06R B011R W013R B02R W010R B07R W014R B04R
W13½ B08R W112½ W15R B19R W115F 5968
9gnugo3pt8 B0922½ B01134½ B02 B06 W0119½ W010 B015 W0549½ B013 B03½ W18R B012½
B14R W17T B114T 4965
10MCark B08R W010R W03R B013R W06R W01R B012R B02R W011R B05R W09R B015F W04R B07T W014T

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.

Nine players registered for the tournament. To make the numbers even, I added 'gnugo3pt8', a build of GNU Go running on one processor of my own Windows system.

I have been advised that I should not compete in these events myself, as it might prejudice my decisions. But GNU Go is not mine, and I believe I am not biassed towards it. I merely think that a game against GNU Go is better than a bye. I believe GNU Go has advantages for use in this way:


AyaMC vs gnugo3pt8
At end of game

In its round 6 game with gnugo3pt8, AyaMC showed that the middle of a 13×13 board is bigger than the edges, as seen to the right.

ManyFaces1 vs StoneGrid
After both players first passed in turn

In the round 7 game between ManyFaces1 and StoneGrid, both players passed in the position shown to the left, and marked the dead stones as shown. They then disagreed about the status of some stones, so play resumed. In this clean-up phase, StoneGrid captured two white stones in the top left, but ManyFaces1 did not capture any of the three dead black groups. Therefore the game was scored as a win to StoneGrid, although ManyFaces1 coul;d have won by removing the three dead black groups.

In round 10, Zen19S lost its only game of the tournament, to ManyFaces1.

Orego12 vs stv
Move 68

In round 14, Orego12 played the move shown to the right, against stv. This looks so strange that I wonder if it was caused by a bug.

AyaMC vs StoneGrid
Move 17
StoneGrid vs AyaMC
Move 16

In both rounds 14 and 15, AyaMC played StoneGrid. In both games, StoneGrid chased AyaMC's stones in a ladder which was broken by a stone belonging to AyaMC. AyaMC won both games. A position from each game is shown to the left.

Also in round 15, MCark failed to join its game with Orego12, and lost on time.

Annual points

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

Many Faces of Go4

Details of processor numbers, power, etc.

Aya, running on 6 cores of an i980X, at 3.3GHz.
GNU Go, running on one Intel i5-2500 CPU @ 3.30GHz.
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.
MC_ark version 6.0, running on Core-i7 2600K 3.40GHz*4core (8 threads) 16GB RAM)
nomitan, running on a machine with 2 Xeon 5680 processors (total of 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 an Intel i7-2600 (4 cores, 8 threads) with 16GiB RAM.
StoneGrid, running on an Intel Core i7-2600.
Steenvreter, maybe running 46 threads each at 2.2 GHz, on a system whose use was generously provided by the Maastricht games and AI group.
Zen, running on a mini computer cluster of a dual 6-core Xeon X5680@3.6 GHz 24GB RAM, a 6-core i7 3930K@4.2 GHz 16 GB RAM, a 6-core Xeon W3680@4 GHz 12 GB RAM, and a 4-core i7 920@3.4 GHz 6 GB RAM PC connected via a GbE LAN. 4 PCs (28 cores) total.