Hardcore "no rules bared" chess is correspondence chess, where you have 24-hours between moves and can use whatever means necessary to make the best move.
If you think just buying a supercomputer and running Stockfish (or LeelaZero) will win, then you don't know anything about opening databases. All the good correspondance chess players have already run Stockfish / LeelaZero across many different openings, and have collected statistics on which openings will lead to situations where Stockfish (or LeelaZero, or Komodo, etc. etc) will inevitably fail.
These computer AI chess programs have weaknesses. A "Cyborg" team, composed of a human guiding Stockfish (or LeelaZero) through opening books can get further than any computer alone, and likely push the opponent into a subtly failing position.
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The article talks about it a bit in Centaur Chess section. That's probably where the biggest challenge lies in the future. Centaurs have access to the 8-man database, you keep opening-books secret, and you spend time studying how Stockfish, Leela Zero, or Komodo (or other engines) makes mistakes.
Or, you write your own engine, and try to use that as an edge.