I'm having troubles opening a brahma lock (without the key of course

I've got a master in lockpicking who taught me all about standart locks,
last week he gave me a brahma lock and told me : make your best but
don't ever come back without having opened it ... nice isn't it ?

I've already seen him opening it with chinese sticks

anyone have an idea on the way it can be opened ? or at least on the
way this type of lock works ?
big thanx to all guys sharing here ...