Chess AIs work by basically brute force with some simple heuristics. Humans still have superior pattern recognition and can play without seeing that many moves into the future at all.

But now the AIs are gaining superior pattern recognition as well. AlphaGo beat expert Go players by training a neural network to recognize good Go moves. Just like how a human would play. And then it combined that with the computers natural ability to search millions of moves. Humans can't add anything to this type of AI.