format | 36-round Swiss | |
---|---|---|

board size | 9×9 | |

rules | Chinese | |

komi | 7 | |

time | 4 minutes plus 10/30s |

The first round started at 08:00 UTC.

This table does not display correctly with Chrome, it is shown without its final column. It displays correctly with Firefox, Internet Explorer, Opera, and Safari.

Black won **67** games, White won **72**, and there were **5** jigoes.

We welcomed a new player to these events, **abakus**, by German programmer Tobias Graf.
Graf was a contributor to Gomorra, the MC-based Go program of Lars Schäfers which was active
from 2010 to 2013.

Seven players registered. I therefore added GNU Go, to make the numbers even.

I cannot make helpful comments on the play, as the players are so much stronger than me. I did think I had found a questionable move in one game, but careful analysis shows me that I was wrong.

The 144 games resulted in 67 black wins, 72 white wins, and 5 jigoes. This balance between black and white wins suggests that the use of 7 for the komi is probably correct. But what I want to discuss here is the proportion of jigoes.

Assuming no odd sekis, there are I think 69 possible score differences on the board at the end of game, with +81 and -81 being the most likely. So, the probability that a game between very weak players ends in jigo is rather less than 1/69, maybe about 1/80, and from 144 games we should expect about two jigoes. With perfect players, and assuming that komi of 7 is in fact correct, we should expect 144 jigoes from 144 games. So, the five jigoes we observed weakly suggests that these player are better than random, and convincingly shows that they are a very long way short of perfect at 9×9 Go.

We can use the proportion of jigoes in the results as a measure of closeness of the players to perfect play. It has a long way to rise, but I anticipate the proportion of jigoes in 9×9 Go will rise steadily over the next few years. In fact, if we consider only the games from this tournament in which both players finished in the top half of the results table, we find five jigoes from forty games, which is encouraging.

Players receive points for the 2015 Annual KGS Bot Championship as follows:

Zen | 8 |

Crazy Stone | 5 |

DolBaram | 3 |

Aya | 2 |

abakus | 1 |

- abakus
- abakus, running on 5 nodes each with two Intel Xeon E5-2670, 2.6GHz and 64 GByte main memory (80 cores total)..
- AyaMC
- Aya, MC version, running on an 980X 3.3GHz, 6 cores.
- CrazyStone
- Crazy Stone, running on Amazon ec2 c4.8xlarge server instance (xeon, 18 cores, 36 threads, 2.9GHz).
- DolBaram
- DolBaram, running on a dual Xeon-X5660, 12 cores at 2.8GHz for rounds 1 to 3, and Amazon C3.8xLarge (2.8GHz * 16core) for rounds 4 to 12.
- gnugo3pt8
- GNU Go, version 3.8, running one thread on one i5-5200 CPU.
- NiceGo19N
- oakfoam, running on an i7-4790K / GTX-970.
- Orego32
- Orego, running on an instance in the Google Compute Engine cloud (type n1-highcpu-32, which has "32 virtual CPUs and 28.8 GB of memory".) The machine runs Centos 7.
- Zen19X
- Zen, running on a dual 10-core Xeon E5-2690 v2@3 GHz 32 GB RAM.