Harry Potter Trading Card Game these expansions include the addition of the "Quidditch" lesson type and "Match" cards introduced in the "Quidditch Cup" expansion, location cards introduced in the "Diagon Alley" expansion, and a larger pool of adventure cards in the "Adventures at Hogwarts" expansion. The fourth and final expansion released was "Chamber of Secrets", which has 140 cards plus 55 Foil or Hologram Portrait Premium rares (October 2002). This last expansion features cards based on the "Chamber of Secrets" book, where all previous cards were based on the "Sorcerer's Stone" book. From its conception in 2001 through 2003, the "Harry Potter Trading Card Game"
Harry Potter and the Methods of Rationality of "HPMOR" spontaneously burped itself into existence inside my mind, so it came out as a Harry Potter story. ... there's a large number of potential readers who would enter at least moderately familiar with the Harry Potter universe." He states that his work on rationality "informs every shade of how the characters think, both those who are allegedly rational and otherwise". He also used it to assist the launch of the Center for Applied Rationality, which teaches courses based on his work. Unlike J. K. Rowling's original books, in which the orphaned Harry Potter is raised by the abusive