Eighty-seventh KGS Computer Go Tournament

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.

Seven 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.

Results


gnugo3pt8 vs MCark
Moves 86-124

In its round 1 game with gnugo3pt8, MCark misread a ladder against gnugo3pt8, as shown to the right. Initially it was a ladder that could be forced around a corner; then it became a ladder that coiuld be diverted to take advantage of a ladder-breaker. Once the ladder-breaker was reached, MCark realised its stones could not be saved, and played elsewhere.

At the start of round 2, stv failed to connect to the server due to a problem with DNS lookup. When its operator Erik van der Werf saw what had happened, he started another instance on an old machine running rather old versions of Steenvreter and kgsGtp. It joined its game with 12 seconds of main time remaining. He hoped it would play and win the entire game against gnugo in byo yomi. But additional netlag made this impossible and it lost on time.

In round 3 the crippled version of Steenvreter started to play AyaMC. But during the game the original machine came back online, kicking the crippled version; which in turn came back, kicking the good version. This continued until Erik noticed and killed the crippled version, but by then AyaMC had a convincing lead.

After round 9, the results table was pleasingly symmetrical

Name	Score
ManyFaces1 [2d]	8
AyaMC [4d]	7
stv [2d]	6
nomiBot2 [2d]	5
pachi [2d]	4
gnugo3pt8 [6k]	3
Orego12 [-]	2
MCark [-]	1

and it seemed likely that ManyFaces1 would win the tournament.

In round 10, ManyFaces1 lost its first game, to pachi.

In round 12, ManyFaces1 and AyaMC were leading, with nine wins each. They played each other, and AyaMC won.

Comment

Every game not involving gnugo3pt8 ended with a resignation.

For me, this is a big improvement on the days when games often ended with a scoring disagreement, so I might have to count the score myself.

Annual points

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

Aya	8
Many Faces of Go	5
Steenvreter	3
pachi	2
nomitan	1

Details of processor numbers, power, etc.

AyaMC: Aya, running all 12 threads on an i7-980X 3.3GHz 6cores +HT.
gnugo3pt8: GNU Go, running on one Intel i5-2500 CPU @ 3.30GHz.
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.
MCark: MC_ark version 6.0, running on Core-i7 3770 3.40GHz*4core (8 threads)
nomiBot: nomitan, running on a machine with 2 Xon E5-2680 processors (total of 16 cores @ 2.7Ghz ).
Orego12: Orego, running on one node of our custom Linux cluster Fido. The node has two AMD Six Core Opteron 2427 2.2 GHz processors (12 cores total), 8 GB RAM, Centos Linux
pachi: pachi, running on an Intel i7-2600 (4 cores, 8 threads) with 16GiB RAM.
stv: Steenvreter, probably running 46 threads each at 2.2 GHz, on a system whose use was generously provided by the Maastricht games and AI group.