Well yahoo is blitz play (generally) while you can have days to think about your move here so the two ratings have no real relation to one another. If you are better at long play your rating will increase; and if blitz was your thing then you may decrease.
I played on yahoo before here too. The biggest difference is the much nicer community here.
Have fun on chess.com! :)
Hello everyone. I'm new to this site but I play a lot on yahoo. Can anyone tell me roughly, how the two ratings compare? What about other rating systems? Thanks