chess partner

hi, this has probably been asked before but i've just dowloaded chess partner and the crafty19;1 engine but i'm not too sure who to use it. I'm playing the computer but how do you know its on the highest difficulty? is tournament level the best to play against? any other tips would also be helpful. thanks

I never used that program before, but you should check in the help file if it has one. crafty is pretty strong though.