Spring 2015 Slow KGS Computer Go Tournament

Sunday March 1st-4th, 2014

These results also appear on an official KGS page.

Rules

format	8-round Swiss
board size	19×19
rules	Chinese
komi	7½
time	235 minutes plus 10/60s

Times

The first round started at 22:00 UTC on March 1st.

Result table

Place	Name	cross-table	Wins	SOS	SoDOS	Notes
Zen19	DolBa	Crazy	AyaMC	NiceG	HiraB
1	Zen19S	X	^W1³_2½ ^B0⁷_½	^W1¹_R ^B1⁵_R	^B1²_R ^W0⁸_1½	^W1⁶_R	^W1⁴_R	6	34	24	Winner
2	DolBaram	^B0³_2½ ^W1⁷_½	X	^W0⁴_R	^B1¹_R ^W1⁵_R	^W1²_R ^B1⁸_R	^B1⁶_R	6	30	18
3	CrazyStone	^B0¹_R ^W0⁵_R	^B1⁴_R	X	^B1⁶_R	^B1³_R ^W1⁷_R	^W1²_R ^B1⁸_R	6	26	14
4	AyaMC	^W0²_R ^B1⁸_1½	^W0¹_R ^B0⁵_R	^W0⁶_R	X	^B1⁴_R	^B1³_R ^W1⁷_R	4	32	8
5	NiceGo19N	^B0⁶_R	^B0²_R ^W0⁸_R	^W0³_R ^B0⁷_R	^W0⁴_R	X	^B1¹_R ^W1⁵_R	2	34	0
6	HiraBot	^B0⁴_R	^W0⁶_R	^B0²_R ^W0⁸_R	^W0³_R ^B0⁷_R	^W0¹_R ^B0⁵_R	X	0	36	0

Place

Name

cross-table

Wins

SOS

SoDOS

Notes

Zen19

DolBa

Crazy

AyaMC

NiceG

HiraB

Zen19S

^W1³_2½ ^B0⁷_½

^W1¹_R ^B1⁵_R

^B1²_R ^W0⁸_1½

^W1⁶_R

^W1⁴_R

Winner

DolBaram

^B0³_2½ ^W1⁷_½

^W0⁴_R

^B1¹_R ^W1⁵_R

^W1²_R ^B1⁸_R

^B1⁶_R

CrazyStone

^B0¹_R ^W0⁵_R

^B1⁴_R

^B1⁶_R

^B1³_R ^W1⁷_R

^W1²_R ^B1⁸_R

AyaMC

^W0²_R ^B1⁸_1½

^W0¹_R ^B0⁵_R

^W0⁶_R

^B1⁴_R

^B1³_R ^W1⁷_R

NiceGo19N

^B0⁶_R

^B0²_R ^W0⁸_R

^W0³_R ^B0⁷_R

^W0⁴_R

^B1¹_R ^W1⁵_R

HiraBot

^B0⁴_R

^W0⁶_R

^B0²_R ^W0⁸_R

^W0³_R ^B0⁷_R

^W0¹_R ^B0⁵_R

Black won 13 games and White won 11.

You can view any game record by clicking on its blue number in the cross-table above.

Results

In round 1, Zen19S and CrazyStone played an interesting game, difficult for the onlookers to understand. Zen19S won a difficult semeai and the game.

In round 3, Zen19S played DolBaram, and for much of the game the onlookers thought that DolBaram was winning. There were complications in the yose, and Zen19S won by 2½ points.


Zen19S vs HiraBot
Move 12

In round 4, Zen19S played move 12 as shown to the right, against HiraBot. This is clearly a poor move: Black will block at p16, and the exchange will benefit Black. Later, when an onlooker asked "what is p15?", Zen19S's operator Hideki Kato replied "might be an overflow". This does not refer to floating-point overflow, but to overflow of an "atomic integer", used for speed in a multi-threaded environment. Other possibilities are a hardware error, or a rare synchronization bug. (My thanks to Hideki Kato for these explanations.)

Annual points

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

Zen	6
DolBaram	5
Crazy Stone	5
Aya	2
oakfoam	1

Details of processor numbers, power, etc.

AyaMC: Aya, MC version, running on one machine: i7 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 (total: 12 cores at 2.8GHz)
HiraBot: HiraBot, version 3.8, running on a i7-3930k@3.2GHz 6 cores 12 threads
NiceGo19N: oakfoam, CNN version, running on i7-4790K / GTX-970.
Zen19S: 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@3.5 GHz 8 GB RAM and a dual 6-core Xeon X5680@3.8 GHz 12 GB RAM computers connected via a GbE LAN. 44 cores total.