It's much simpler than that. Every chess move has an accuracy score where 100% means that it is optimal play according to the top chess engine(which can easily

It's much simpler than that. Every chess move has an accuracy score where 100% means that it is optimal play according to the top chess engine(which can easily beat any human). Anyone with an abnormally high accuracy is a cheater. Anyone with a high accuracy simply needs to verify who they are a la twitter style.