This link
http://www.schaakbond.nl/knsb/handboek/knsb-commissies-en-hun-reglementen/Rekenregels%20KNSB%20Ratingsysteem.pdf
ignore the foreign jibberisch go to page 7.
Knock yourself out: 
nb (0,5150 means it is expected that the higher rated player wins 51,50% of the games)
I would like to see tables showing how often a player rated 100 points higher than his opponent is expected to win, 200 points higher, 300 etc.