sobek: I am totally agreing and this very certain that computer is a problem in "offline" site. This is also the main reason why I hardly ever play chess, unless I know my opponent in real life and trust him.

On the other hand, it is hopeless to get rid of computer assisted opponent. You can write code of conducts, etc...

An opponent playing only the computer moves would be bored quite quickly. However, if you do "study" with a computer, it will be almost impossible to detect.

Also, I am sure that you use a computer to play here at least to make your move and talk on the forums ;-)