Ninetieth KGS Computer Go Tournament

Sunday April 16th, 2013

These results also appear on an official KGS page.


format12-round Swiss
board size13×13
time19 minutes plus 10/30s


The first round started at 08:00 UTC.

Result table

Zen19 pachi ManyF AyaMC fuego NiceG MCark Orego
W14R B19R W11R B110R B13R W17R W12R B111R W15R B112R W16R W18R 126969Winner
2pachi B04R W09R
B06R W18½ B01R W110R B111R B13R W112R B17R W12R W15R 88041
3ManyFaces1 B01R W010R W16R B08½
B0412½ W19R B17R B13R W111R B15R W112R W12R 87334
4AyaMC W03R B07R W11R B010R W011R W1412½ B09R
B15R W12R B18R W16R B112R 77830
5fuego13 B02R W011R W03R B012R W07R W05R
W16R B18R B11R W19R W14R B110R 66914
6NiceGo19N B05R W012R W07R W03R B011R B02R B06R W08R
W14R B110R B11R W19R 4736
7MCark B06R B02R W05R B012R W08R W01R B09R B04R W010R
B13R W17R B011R 2662
8Orego12 B08R B05R B02R B06R W012R B04R W010R W01R B09R W03R B07R W111R

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.

Black won 20 games and White won 28.


fuego13 vs AyaMC
Moves 13-15

In round 5, AyaMC played move 13 as shown to the right, against fuego13. This seemed odd to me. My thoughts were "I can see that it wants to save the cutting stone at e5, but this doesn't work, White can now play at f5 and catch the stone in a ladder. That's strange, AyaMC is a solid reliable program, it does not normally misread ladders". Fuego13 did play 14 at f5. AyaMC played tenuki with 15, and went on to win the game.

I don't know whether AyaMC really misread a ladder here, or whether the exchange of 13 for 14 was good for Black. Aya is much stronger than me, particularly on a small board, so its move 13 was probably good, though I still think it looks strange.

Hideki Kato has confirmed my views about move 13, writing "Zenith 4 (English version of Tencho no Igo 4) preferred F5 as the third best (first is D5) and the winrate of Aya dropped after W F5. You're right, B F4 must be bad (at least worse than F5). Possibly a bug.".

Annual points

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

Many Faces of Go4

Details of processor numbers, power, etc.

Aya, MC version, running on 980X 3.3GHz 6cores
Fuego running on 8 core Intel(R) Xeon(R) CPU E5420 @ 2.50GHz
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, running on Core-i7 3770 3.40GHz*4core (8 threads)
oakfoam, running on i7-2600K
pachi, running on unspecified hardware, possibly 4 cores i7-920.
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.
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.