Does high chess accuracy mean someone is cheating?

- Measure a correlation between position complexity and time spent per move. You would expect a good move to take longer to calculate in complex positions.

- Move timing consistency, humans are all over the place with timing, whereas cheaters often move regularly.

- Long pause, then strong play. If a cheater starts cheating half way through a game, then there could be a transition period where they first enter the position into the engine.