One statistician has developed a system to compare players across time. I don't know enough about statistics to say if it's valid or not, but it's interesting t

One statistician has developed a system to compare players across time. I don't know enough about statistics to say if it's valid or not, but it's interesting to look at. Unfortunately, it hasn't been updated in almost a decade, since it says Carlsen's peak rating was 2556 in January 2005. http://www.chessmetrics.com/cm/ http://www.chessmetrics.com/cm/