Ahhhh Max Euwe ! Dutch worldchampion chess in the 30ies. His older opponents were people like Capablanca (I love that guy), Lasker, Aljechin. My father had some old chess books written by Max Euwe. Max Euwe was BTW teacher Math at a secondary school for girls. Some didactic qualities were there. He was also of the (rare) opinion that playing a game of chess was not about playing against your opponent, but about understanding the situation at the chess board. That delivered me a split personality. I studied chess like Euwe, I played like that with my friends, but in competition I played only to destroy the self-confidence of my opponent, and pick up the spoils after that. Me badass and jerk.