Have your friends watch the game and use computers to analyse it. Then they send you messages in morse code over remote control vibrating anal beads.

Computers are better than the best players in the world. You ask a computer and follow it's moves. When playing online, you can have a bunch of cues to tell you what to do without making it super obvious that you are cheating. Which is why the anal vibrator thing became a meme.

Chess engines are stronger than people at playing chess because they can calculate layers deeper than humans. The highest rated human is 2856. We think the rating for the best chess engine is 3500 but it's a guess. So the accusations again Niemann are that he would occassionally change tabs to a copy of the game and use the engine moves to give himself an advantage. He doesn't need to follow it the whole game, just enough to put himself ahead of his opponent.

Use a computer one way or another (or get assistance from a better human player)