You could play your Fritz 10 versus your Chessmaster GM and see who wins. :)
Estimated Elo?

In CM you can play in ranked (rated) mode which allows you to play a bunch of pre-rated opponents. Depending on whether you win or lose, CM will recommend another opponent within your skill range. Keep on playing to get a general idea of your ELO.
This won't give you a pin point accurate ELO but it will give a good range where you fall within.
Hey guys. I have both Fritz 10 and Chessmaster GM edition. I haven`t really used them as much as i maybe should have done, so i am not familiar with all the fancy stuff these programs can do...The question i have is this: Is there a way to get a estimated elo-strenght of my play in Fritz 10 or CM? Like playing a game against the engine and then get a rating or elo-estimate from the program?
PS: I know that the best way to get an accurate elo-rating is by playing rated OTB-tournaments:)