Remember that the computer chess AI is actually a snapshot of the intelligence of a human being. I don't see this distinction made enough. If you are struggling against a game, you are struggling against the one who made it.
Or the engine could make use of techniques such as genetic algorithms to improve itself. Meaning its abilities wouldn't necessarily relate to its creator.
The program has been taught and empowered to make decisions the person can't make. It's no more a snapshot of the person than a child is a snapshot of its parents.