Seventy-first KGS Computer Go Tournament

In the table above,
   0 indicates a loss
   1 indicates a win
   J indicates jigo
   a superscript indicates the round in which a 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.

Twelve players registered. We welcomed one new player, Cyrago, by French programmer Harald Johnsen. Cyrago is derived from an old version of libego by Łukasz Lew, and also uses Mark Boon's ladder code.

Results


WeakBot50k vs PnuGo
Moves 44-80

In round 2, WeakBot50k chased PNUGo's stones in a ladder that did not work for two reasons ‒ there was an extra liberty, and there was a ladder-breaker. PNUGo played correctly, as seen to the right, but spent a lot of time thinking about each move, using up most of its time for the game. However it was able to play fast in its remaining time, and win the game.


ManyFaces1 vs pachi2
Moves 63-67

In round 3 CzechBot got a won position against WeakBot50k, but then, with 3 seconds of main time left on its clock, started passing, allowed its opponent to capture some of its groups, and lost the game. It acted as if it was unaware of the overtime.

Also in round 3 Zen19 beat pachi2, to become the only played on three wins.

In round 4 ManyFaces1 and pachi2 fought a semeai in the top right of the board, as shown to the left. When ManyFaces1 tenukied with move 64, and again with 66, pachi2 played further moves to secure its win of the semeai. I find it hard to believe that this sequence can have been correct: if the semeai was unsettled White should not have tenukied, and if it was settled in Black's favour, Black should not have played there again. Pachi eventually won this game.

In round 7 CzechBot was missing from the server. It did not join its game with ManyFaces1, and lost on time. Its operator eventually realised that the computer it was running on had been switched off, and got it restarted in time for the next roiund.

In round 8 break19 was missing from the server. It lost all its subsequent games on time.

As in round 3, CzechBot again started passing when it had only 3 seconds of main time left, and lost the game as a result.

Cyrago beat PNUGo by half a point, having allowed its opponent to fill several dame while it filled its own territory, as is common with MC-based programs.

Players receive points for the 2011 Annual KGS Bot Championship as follows:

Zen	8
pachi	4
Many Faces of Go	4
Aya	2
MoGo	1

Details of processor numbers, power, etc.

AyaMC: Aya, running on 6 cores of an i980X 3.3GHz
break9: break, probably running on a single processor Intel(R) Celeron(R), 1.7Ghz
Cyrago: Cyrago, probably running on a single thread of a Q9550 @ 2.8 Ghz.
CzechBot: a development version of MoGo current as of 2010-10-06, running on an 8-thread i7 920, 6GiB RAM
IdiotBot: running on Linux, 2GiB RAM, Intel(R) Celeron(R) M CPU 530 @ 1.73GHz
ManyFaces1: Many Faces of Go, running on a 12 core Xeon; using pondering, for the first time
Orego12: Orego, probably running on one of the five nodes of a custom Linux cluster built by PSSC Labs: the node has two AMD Six Core Dual Opteron 2427 2.2 GHz (12 cores total), 8 GB RAM, Centos Linux.
pachi2: pachi, running on 64 unspecified 20-core platforms.
PNUGo: GNU Go, unspecified platform
SimpleBot: running on one processor of a 4GiB RAM, AMD Athlon(tm) 64 X2 Dual Core Processor 4000+, shared with WeakBot50k
WeakBot50k: running on Linux, 2GiB RAM, Intel(R) Celeron(R) M CPU 530 @ 1.73GHz
Zen19: Zen, running on a Mac Pro 8 core, Xeon 2.26GHz