Once a player goes above 2000, they are autmatically checked for engine use & Cc has probaly da best detecters than any other Chess site!
There's no automatic checking, and they're very lax with cheaters, especially if they're paying members... As for the quality of the detection, there are some websites which are much better, but I can't name them here.
Yes, and there are many, many more like him...
But this one is his. His pieces are his best friend. It is his life. He must master his pieces as he must master his life. Without him, his pieces are useless. Without his pieces, he is useless. He must develop his pieces true. He must play more efficiently than his enemy, who is trying to mate him. He must mate his enemy before the enemy mates him. He will. Before God he swears this creed: his pieces and himself are defenders of his side of the board, he is the master of his enemy, the pieces are the saviors of his life. So be it, until there is no enemy, but checkmate. Amen.