Many Faces also had more trouble against pachi than you would expect from its rating. Perhaps Pachi is generally stronger, but throws away some percentage of games (even against weak players) because of some bug.
David > -----Original Message----- > From: computer-go-boun...@computer-go.org [mailto:computer-go- > boun...@computer-go.org] On Behalf Of Brian Sheppard > Sent: Thursday, October 08, 2009 12:48 PM > To: computer-go@computer-go.org > Subject: [computer-go] Rating variability on CGOS > > About two weeks ago I took Pebbles offline for an extensive overhaul of > its > board representation. At that time Valkyria 3.3.4 had a 9x9 CGOS rating > of > roughly 2475. > > When I looked today, I saw Valkyria 3.3.4 rated at roughly 2334, so I > wondered what was going on. > > I found a contributing factor: Valkyria has massively different results > against Pachi than against Pebbles. It happens that Pachi started > playing a > day or two after Pebbles went offline. > > Pebbles and Pachi are both rated around 2200, but Valkyria shreds > Pebbles a > lot more often than Pachi: > > Pachi: 185 / 273 = 67.8% > Pebbles: 429 / 503 = 85.3% > > There are a lot of lessons here... > > _______________________________________________ > computer-go mailing list > computer-go@computer-go.org > http://www.computer-go.org/mailman/listinfo/computer-go/ _______________________________________________ computer-go mailing list computer-go@computer-go.org http://www.computer-go.org/mailman/listinfo/computer-go/
