Is it cheating if you make decisions to purposefully not gain an advantage (ignoring gambling-induced outcomes, like throwing a match)?
"He was cheating! An outside influence was telling him which move to make and he purposefully didn't do it!"
"He was cheating! An outside influence was telling him which move to make and he purposefully didn't do it!"
Chess engines like Hiarcs can show a series of good, ok, questionable and bad moves for each touched piece color-coded on the board for example.