gnubg's mysterious graph

If you play GNU Backgammon, you've probably seen this graph and wondered what it meant. Well, the 'net is wide, the 'net is wise, the net is ever at your side, and such, to wit, is the sense thereof:

"This graph shows the total error rates per game for each player. The games are along the bottom and the error rates up the side. Chequer error in green, cube error in blue."

But I don't remember where I found that (possibly here.)

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Bwa-hahaha-ha! I finally won a game of Go at IGS!

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Hi, Guy!