Ninety-eighth KGS Computer Go Tournament

Sunday December 8th, 2013

These results also appear on an official KGS page.


format10-round Swiss
board size13×13
time19 minutes plus 10/30s


The first round started at 16:00 UTC.

Result table

Crazy AyaMC DolBa pachi nomiB NiceG
W13R B16R B12T W07R B14R W08R B11R W19R B15R W110R 84433Winner
2AyaMC B03R W06R
W15 B110 B12R W19R B14R W07R W11R B18R 74626
3DolBaram W02T B17R B05 W010
W11R B06 B13R W18R B14R W19R 64821
4pachi W04R B18R W02R B09R B01R W16
B15R W010R W13R B17R 55018
5nomiBot4 W01R B09R W04R B17R W03R B08R W05R B110R
W12R B16R 45212
6NiceGo19N W05R B010R B01R W08R W04R B09R B03R W07R B02R W06R
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 18 games and White won 12.


CrazyStone vs AyaMC
Moves 141-146

In round 3, the later part of the game involved many meaningless moves, such as those shown to the right (move 142 is worth one point in gote, while the other numbered moves in the diagram are worth nothing). Meanwhile, both players ignored the black group in the top right corner. My understanding is that this group is in fact dead; and I believe that both the players are strong enough that they knew this. So I wonder why Black continued to make meaningless moves, rather than resigning.
      AyaMC's programmer, Hiroshi Yamashita, has explained, "Yesterday I turned off bent4 code for test, and forgot. Aya understands bent4 as seki. And at end of playout, bent4 shape is counted as dead. It works well, but when outside of bent4 is semeai, it does not work. Maybe when outside W lib is 5, W has to play N12?".

AyaMC vs DolBaram
Moves 3, 5, 7, 8: pass.
Entire game shown.

In round 5, DolBaram, playing against AyaMC, passed for its move 3, 5 and 7. AyaMC then also passed, and the game was scored in the position shown to the left. This was counted as a win to White, by 9½ points. I understand the logic of this counting: White has three points, Black has one, and there are 165 dame points, so White is two points ahead on the board, which with 7½ komi makes 9½.

In round 7 CrazyStone suffered its first loss, to DolBaram.

In round 8 CrazyStone suffered its second loss, to pachi.

Annual points

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

Crazy Stone8

Details of processor numbers, power, etc.

Aya, MC version, running on one machine: 980X 3.3GHz 6 cores.
Crazy Stone, running on a 24-core server
DolBaram, running on an i7-970 (4 cores).
nomitan, running on a cluster of 15 machines, total of 140 cores, with a frequency between 2.2Ghz and 2.7Ghz.
oakfoam, running on a mini cluster: i7-2600K + i7-920
pachi, unspecified but probably running on 2x Opteron 6134 (15 threads) with 64GiB RAM.