turtle, the general points system followed is as follows:
pawn - 1pt.
knight/bishop - 3pts.
rook - 5pts.
queen - 10pts.
of course points are not everything... the position of your piece also matters.. for example you might not mind losing a bishop or rook to save a pawn on the 7th row.. and points dont have any bearing on the game result.. it is just a basic framework to help beginners understand the value of different pieces
Just adjusting this, but isnt the queen worth 9 points?
ratings arent always acurate, keep that in mind. If someone doesnt play for a while then their rating will be lower (or higher) than their actuall skill