Of the 3 female INTJs I’ve known, two were Machiavellian during their high school years. (When I talked to the third about it she was horrified/very strongly morally opposed.) There’s something about being very intelligent in high school that can be very lonely. I haven’t met a male INTJ that had this level of people-as-a-chess-game knowledge. I think female INTJs are often forced into roles that are uncomfortable and/or alienating to them (“How can you be so heartless?”, “You should be more empathetic!”), gaining a deep knowledge of how to maneuver people is one way of not feeling or being powerless. I’ve seen good and damage done by them. Definitely interesting to talk to them about people their insight is a different one. Type of INTJ to be most likely mistaken for an INFJ.