Chess has a couple dozen rules, including how the pieces move, and alphazero played millions of games against itself to learn strategies and tactics to a level that would beat stockfish. Humans have millions of rules, and there are no do-overs when you kill people or violate their rights, at least for the people in question. (If, ideed, you care one whit about such considerations.)
Doing unexpected crazy is how Kasporov beat Deep Blue in the first human computer match because he understood he was playing against the grandmasters whom the programmers used for game input, not a computer. Take away the 10 ply lookahead and the playing field got equaled.