Board Game Arena

He pillado a varios usando programas de ajedrez. ¿Cómo reportarlos?

Unless you have an easily reproducible method in which to detect such programs, you may as well not report it at all.

There are websites (I forget the name(s)) which can give you a percentage score of play like an engine. But you'll have to submit the pgn, which will be pretty hard to do from BGA games.