I used to play email chess a long time ago, in fact someone on this forum also I met there before I picked up on bitcoin. It is fun, but you always knew when you were playing against someone using computer software, which is impossible to detect just have a lot of suspicion when you try ask them why they make the move and they cannot explain.
This is rather strange since the computer analysis shows the main line after the proposed move and all the ideas are obvious. If a player cannot describe it in words, then he either does not use computer analysis or plays so badly that he does not even understand the meaning of the moves.