It's not that it is not detecting it, I think he means that it isn't reporting it.
That is correct.
Other presets announce check but I'm not sure how they do it.
They do it with the say command. This displays a message on screen and also inserts it as an inline comment after a move. It is intended for short game-related messages.
That is correct.
They do it with the say command. This displays a message on screen and also inserts it as an inline comment after a move. It is intended for short game-related messages.