Spring 2014 Slow KGS Computer Go Tournament

Sunday March 2nd-5th, 2014

These results also appear on an official KGS page.


format8-round Swiss
board size19×19
time235 minutes plus 10/60s


The first round started at 22:00 UTC.

Result table

Zen19 AyaMC NiceG gnugo
B12R W04R B17R B13R W15R B18R W1130½ B16R 72721Winner
2AyaMC W02R B14R W07R
B11R W16R B1323½ W1522½ B18R 62713
3NiceGo19N W03R B05R W08R W01R B06R
W12R B14 W17R 3330
4gnugo3pt8 B0130½ W06R W0323½ B0522½ W08R B02R W04 B07R
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 10 games and White won 6.


Only three players, Zen19S, AyaMC and NiceGo19N registered. CrazyStone did not register becasue it was preparing for the 7th UEC Cup, to be played in Tokyo on March 15-16. I see that many other strong programs, including DolBaram, Fuego and Nomitan will also be playing in the UEC Cup. In future years I will plan to avoid such clashes.

To make the numbers even and avoid byes, I included GNU Go, running on a single processor.

NiceGo10N vs AyaMC
Moves 39 and 401

In round 1, AyaMC, playing black against NiceGo19N, played move 39 as shown to the right. This surprised me, a move at S10 looks better. Several onlookers also criticised move 40. However it is good enough to win the semeai on the right edge. AyaMC went on to win this game.

NiceGo10N vs Zen19S
Moves 80-100

In round 3, NiceGo19N played white against Zen19S. For move 80, I had expected it to play at 82, aiming to kill a black group and save a white group in ko. However it played elsewhere first. Then, for move 84, I expected it to follow up its move 82 by playing at 86; again, it played elsewhere first. Then, for move 90, I expected it to follow up its move 89 by playing at 100; instead, it first played five moves elsewhere.
       I found it surprising that White was not quicker to start this large ko, and that Black was not quicker to play a defensive move to win the semeai without ko. Onlookers discussed the issue: one view was that Black was going to win the ko anyway, and so had little need for a defensive move; another was that White was going to win the game anyway, and could afford to play as it did. In fact, White won the ko fight and lost the game.

In round 3, Zen suffered its only loss, to AyaMC. AyaMC's creator, Hiroshi Yamashita, remaked that this is Aya's only win against Zen in the last four years. Zen 19S's operator Hideki Kato wrote, "The game was so complicated and exciting. Aya overtook Zen at the L&D of Zen's huge group at right side and killed it. The game, however, was not over yet. Zen tried to reverse many times but failed, and Aya eventually won the game."

Annual points

Players receive points for the 2014 Annual KGS Bot Championship as follows:


Details of processor numbers, power, etc.

Aya, MC version, running on one machine: 980X 3.3GHz 6 cores.
oakfoam, running on a mini cluster: i7-2600K + i7-920.
Zen, running on a mini cluster of a dual 10-core Xeon E5-2690 v2@3 GHz 32 GB RAM, a dual 6-core Xeon X5680@4 GHz 24 GB RAM, a dual 6-core Xeon X5680@3.8 GHz 12 GB RAM, a 6-core i7 3930K@3.2 GHz 16 GB RAM computers; all connected via a GbE LAN. 50 cores total.
GNU Go, version 3.8, running one thread on one i5-5200 CPU