Harry Potter and the Methods of Rationality

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Harry Potter and the Methods of Rationality
AuthorEliezer Yudkowsky
CountryUnited States
GenreHarry Potter fan fiction, hard fantasy
Publication date
28 February 2010–14 March 2015
Media typeDigital serial

Harry Potter and the Methods of Rationality (HPMOR) is a Harry Potter fan fiction by Eliezer Yudkowsky published on FanFiction.Net as a serial from February 28, 2010,[1] to March 14, 2015,[2] totaling 122 chapters and over 660,000 words.[3][4] It adapts the story of Harry Potter to explain complex concepts in cognitive science, philosophy, and the scientific method.[5][6] Yudkowsky's reimagining supposes that Harry's aunt Petunia Evans married an Oxford professor and homeschooled Harry in science and rational thinking,[2][4] allowing Harry to enter the magical world with ideals from the Age of Enlightenment and an experimental spirit.[7] The fan fiction spans one year, covering Harry's first year in Hogwarts.[8] HPMOR has inspired other works of fan fiction, art, and poetry.[9]


In this fan fiction's alternate universe to the Harry Potter series, Lily Potter magically made Petunia Evans prettier, letting her abandon Vernon Dursley and marry Oxford professor Michael Verres. They adopt their orphaned nephew Harry James Potter as Harry James Potter-Evans-Verres, him and Michael unaware of his heritage, and homeschool him in science and rationality. When Harry turns 11, Petunia and Professor McGonagall inform him and Michael about the wizarding world and Harry's defeat of Lord Voldemort. Harry becomes irritated over wizarding society's inconsistencies and backwardness. When boarding the Hogwarts Express, circumstances make Harry befriend Draco Malfoy over Ron Weasley. Harry also befriends Hermione Granger over their scientific inclinations.

At Hogwarts, the Sorting Hat sends Hermione to Ravenclaw and Draco to Slytherin. Harry accidentally makes it self-aware, talks to it, and ultimately enters Ravenclaw. As school begins, Harry feels patronized by McGonagall and Headmaster Dumbledore, bonds with Professor Quirrell, and tests magic through the scientific method with Draco and Hermione. Harry invents partial Transfiguration, a magical technique that transmutes parts of wholes by applying timeless physics. Quirrell starts a program involving "student armies" with Harry, Draco, and Hermione as first-year generals.

After winter break, Hogwarts procures a Dementor to teach students the Patronus charm. Though Hermione and Harry initially fail, Harry recognizes Dementors as shadows of death. Resolving to defeat death, he invents the True Patronus charm, destroying the Dementor. After learning the regular Patronus, Draco discovers Harry can speak Parseltongue. Quirrell reveals himself as a snake Animagus to Harry and convinces him to help spirit a supposedly innocent Bellatrix Black from Azkaban, leaving her hidden.

After army battles, bullying incidents, and hearing a phoenix's call, Hermione establishes the organization S.P.H.E.W. to protest misogyny in heroism. Suddenly, she gets accused of Draco's attempted murder. Harry pays his fortune to Lucius Malfoy, Draco's father, to save Hermione from Azkaban, after which Lucius withdraws Draco from Hogwarts. Harry and the staff theorize that Quirrell is David Monroe, a long-missing opponent of Voldemort. A mountain troll subsequently enters Hogwarts and kills Hermione before Harry manages to kill it. Grieving, Harry vows to resurrect Hermione and preserves her body. Harry absolves the Malfoys of guilt in Hermione's murder in exchange for Lucius returning his money, exonerating Hermione, and returning Draco to Hogwarts.

Quirrell starts eating unicorns to delay death from a supposed "disease." Near the end of the year, he captures Harry, revealing himself as Voldemort's spirit possessing Quirrell and how he framed and murdered Hermione by proxy. He coerces Harry into helping him steal the Philosopher's Stone, an artifact for performing true transmutation, as Transfiguration is otherwise temporary, by promising to resurrect Hermione. They magically coax the Stone from the Mirror of Erised in Hogwarts; when Dumbledore appears and tries to exile Voldemort outside time, Voldemort endangers Harry, forcing Dumbledore to seal himself instead. Voldemort's spirit abandons Quirrell and embodies using the Stone; he and Harry resurrect Hermione with the power of the Stone and Harry's True Patronus. Voldemort murders Quirrell as a human sacrifice for a ritual to give Hermione a Horcrux and the superpowers of a mountain troll and unicorn, rendering her near-immortal. Voldemort knows Harry is prophesied to destroy the world but is wary of interfering, as he failed to thwart Harry's prophesized power to defeat him when he attacked the Potters. He summons Lucius and his other Death Eaters, forces Harry into a magical oath never to risk destroying the world, and orders his murder. Harry quickly improvises a partial Transfiguration attack that kills every Death Eater and maims Voldemort; he magically stuns, memory-wipes, and imprisons him by Transfiguring him into his ring's jewel. Harry claims the Philosopher's Stone and stages a scene looking like "David Monroe" died defeating Voldemort and resurrected Hermione.

After the battle, Harry receives Dumbledore's letters from the Order of the Phoenix, learning Dumbledore gambled the world's peoples' future on him due to prophecies and let Harry inherit his positions and assets. Harry helps a grieving Draco find his mother, Narcissa, whom Draco believed Dumbledore had murdered. He plans with the resurrected Hermione to overhaul wizarding society by destroying Azkaban with the True Patronus and using the Philosopher's Stone to grant everyone immortality.


Yudkowsky wrote Harry Potter and the Methods of Rationality to promote the rationality skills he advocates on his community blog LessWrong.[10][11] According to him, "I'd been reading a lot of Harry Potter fan fiction at the time the plot of HPMOR spontaneously burped itself into existence inside my mind, so it came out as a Harry Potter story, [...] If I had to rationalize it afterward, I'd say the Potterverse is a very rich environment for a curious thinker, and there's a large number of potential readers who would enter at least moderately familiar with the Harry Potter universe."[1]

Yudkowsky has used HPMOR to assist the launch of the Center for Applied Rationality, which teaches courses based on his work.[1]

Yudkowsky refused a suggestion from David Whelan to sell HPMOR as an original story after rewriting it to remove the Harry Potter setting's elements from it to avoid copyright infringement like E. L. James did with Fifty Shades, which was originally a Twilight fan fiction, saying, "That's not possible in this case. HPMOR is fundamentally linked to, and can only be understood against the background of, the original Harry Potter novels. Numerous scenes are meant to be understood in the light of other scenes in the original HP."[1]

After HPMOR concluded in 2015, Yudkowsky's readers held many worldwide wrap parties in celebration.[1]


Critical response[edit]

Yudkowsky giving a talk at Stanford University

Harry Potter and the Methods of Rationality is highly popular on FanFiction.Net, though it has also caused significant polarization among readers. In 2011, Daniel D. Snyder of The Atlantic recorded how HPMOR "caused uproar in the fan fiction community, drawing both condemnations and praise" on online message boards "for its blasphemous—or brilliant—treatment of the canon."[12] In 2015, David Whelan of Vice described HPMOR as "the most popular Harry Potter book you've never heard of" and claimed, "Most people agree that it's brilliantly written, challenging, and—curiously—mind altering."[1]

HPMOR has received positive mainstream reception. Hugo Award-winning science fiction author David Brin positively reviewed HPMOR for The Atlantic in 2010, saying, "It's a terrific series, subtle and dramatic and stimulating… I wish all Potter fans would go here, and try on a bigger, bolder and more challenging tale."[12] In 2014, American politician Ben Wikler lauded HPMOR on The Guardian as "the #1 fan fiction series of all time," saying it was "told with enormous gusto, and with emotional insight into that kind of mind," and comparing Harry to his friend Aaron Swartz's skeptical attitude.[13] Writing for The Washington Post, legal scholar William Baude praised HPMOR as "the best Harry Potter book ever written, though it is not written by J.K. Rowling" in 2014[14] and "one of my favorite books written this millennium" in 2015.[2] In 2015, Vakasha Sachdev of Hindustan Times described HPMOR as "a thinking person's story about magic and heroism" and how "the conflict between good and evil is represented as a battle between knowledge and ignorance," eliciting his praise.[8] In 2017, Carol Pinchefsky of Syfy lauded HPMOR as "something brilliant" and "a platform on which the writer bounces off complex ideas in a way that's accessible and downright fun."[9] In a 2019 interview for The Sydney Morning Herald, young adult writer Lili Wilkinson said that she adores HPMOR; according to her, "It not only explains basically all scientific theory, from economics to astrophysics, but it also includes the greatest scene where Malfoy learns about DNA and has to confront his pureblood bigotry."[4] Rhys McKay hailed HPMOR in a 2019 article for Who as "one of the best fanfics ever written" and "a familiar yet all-new take on the Wizarding world."[15]

James D. Miller, an economics professor at Smith College and one of Yudkowsky's acquaintances, praised HPMOR in his 2012 book Singularity Rising as an "excellent marketing strategy" for Yudkowsky's "pseudoscientific-sounding" beliefs due to its carefully crafted lessons about rationality. Though he criticized Yudkowsky as "profoundly arrogant" for believing that making people more rational would make them more likely to agree with his ideas, he nonetheless agreed that such an effort would gain him more followers.[10]


The HPMOR fan audiobook was a Parsec Awards finalist in 2012 and 2015.[16][17]



A rejected cover variant of the Russian print project available as a dust jacket.

On July 17, 2018, Mikhail Samin, a former head of the Russian Pastafarian Church who had previously published The Gospel of the Flying Spaghetti Monster in Russian,[18] launched a non-commercial crowdfunding campaign hosted on Planeta.ru alongside about 200 helpers to print a three-volume edition of the Russian translation[19] of Harry Potter and the Methods of Rationality.[18] Lin Lobaryov, the former lead editor of Mir Fantastiki, compiled the books.[20] Samin's campaign reached its 1.086 million ₽ (approximately US$17 000) goal within 30 hours;[21] it ended on September 30 with 11.4 million ₽ collected (approximately US$175 000), having involved 7,278 people, and became the biggest Russian crowdfunding project for a day before a fundraiser hosted on CrowdRepublic for the Russian translation for Gloomhaven surpassed it.[18]

Though Samin originally planned to print 1000 copies of HPMOR, his campaign's unprecedented success led him to print twenty-one times more copies than that. Yudkowsky supported Samin's efforts and wrote an exclusive introduction for HPMOR's Russian printing, though the campaign's popularity surprised him.[18] Samin's HPMOR publication project is the largest-scale effort on record,[22] surpassing many previous low-circulation fan printings,[20] and he sent some Russian copies of HPMOR to libraries and others to schools as prizes for Olympiad winners.[18][22] J.K. Rowling and her agents refused Russian publishing house Eksmo's request for commercial publication of HPMOR.[18]


Covers of the Hebrew printed edition

HPMOR has Czech,[23] Chinese,[24] French,[25] German,[26] Hebrew,[27] Indonesian,[28] Italian,[29] Japanese,[30] Norwegian,[31] Spanish,[32] Swedish,[33] and Ukrainian[34] translations.

See also[edit]


  1. ^ a b c d e f Whelan, David (2 March 2015). "The Harry Potter Fan Fiction Author Who Wants to Make Everyone a Little More Rational". Vice. Retrieved 23 December 2015.
  2. ^ a b c Baude, Will (14 March 2015). "Harry Potter and the Methods of Rationality is complete, and it is excellent". The Washington Post. Retrieved 23 December 2015.
  3. ^ Yudkowsky, Eliezer Shlomo (28 February 2010). "Harry Potter and the Methods of Rationality Chapter 1: A Day of Very Low Probability, a harry potter fanfic". FanFiction.Net. Retrieved 29 July 2018.
  4. ^ a b c Kembrey, Melanie (21 July 2019). "'Ridiculed and not taken seriously': why fan fiction deserves more credit". The Sydney Morning Herald. Retrieved 10 March 2021.
  5. ^ Mulligan, Christina (11 February 2015). "The most scandalous part of 'Fifty Shades of Grey' isn't the sex and bondage". The Washington Post. Retrieved 10 September 2021.
  6. ^ Packer, George (20 November 2011). "No Death, No Taxes". The New Yorker. Retrieved 11 June 2017.
  7. ^ Bonazzo, John (9 May 2018). "Elon Musk and Grimes Are Dating Thanks to This Weird AI Conspiracy Theory". The New York Observer. Retrieved 10 March 2021.
  8. ^ a b Sachdev, Vakasha (17 October 2015). "A Harry Potter story you haven't read". Hindustan Times. Retrieved 23 December 2015.
  9. ^ a b Pinchefsky, Carol (2 November 2017). "Stuff We Love: Harry Potter and the Methods of Rationality is a love letter to Ravenclaws". Syfy. Archived from the original on 21 January 2021. Retrieved 10 March 2021.
  10. ^ a b Miller, James D. (16 October 2012). Singularity Rising: Surviving and Thriving in a Smarter, Richer, and More Dangerous World. Dallas, Texas: BenBella Books. pp. 37–38. ISBN 978-1-936661-65-7. Retrieved 23 December 2015.
  11. ^ Kahn, Jennifer (14 January 2016). "The Happiness Code". The New York Times. Retrieved 10 March 2021.
  12. ^ a b Snyder, Daniel D. (18 July 2011). "'Harry Potter' and the Key to Immortality". The Atlantic. Retrieved 23 December 2015.
  13. ^ Raptopoulos, Lilah (11 July 2014). "Listen to this: Ben Wikler and Aaron Swartz's The Good Fight". The Guardian. Retrieved 10 March 2021.
  14. ^ Baude, Will (14 May 2014). "More thoughts on the rules of Quidditch". The Washington Post. Retrieved 10 March 2021.
  15. ^ McKay, Rhys (17 August 2019). "Here's 10 Harry Potter Fanfics That You Should Read Right Now". Who. Archived from the original on 16 February 2022. Retrieved 10 March 2021.
  16. ^ "2012 Parsec Awards Winners & Finalists". Parsec Awards. Archived from the original on 7 February 2021. Retrieved 10 March 2021.
  17. ^ "2015 Parsec Awards Winners & Finalists". Parsec Awards. Archived from the original on 8 February 2021. Retrieved 10 March 2021.
  18. ^ a b c d e f Зеркалева, Александра (2 October 2018). "Российский краудфандинговый рекорд побила книга по мотивам "Гарри Поттера". Контролировать печать будет ФБК" [The Russian crowdfunding record was broken by a book based on Harry Potter. FBK will control the printing]. Meduza (in Russian). Retrieved 23 October 2018.
  19. ^ "Гарри Поттер и методы рационального мышления" [Harry Potter and the Methods of Rationality]. гпмрм.рф (in Russian). Retrieved 30 May 2023.
  20. ^ a b "История о "мальчике, который выжил" для взрослых" [The story of the "boy who lived" for adults]. REGNUM News Agency (in Russian). Moscow. 16 August 2018. Retrieved 23 October 2018.
  21. ^ Алисултанова, Ася (1 October 2018). "Книга "Гарри Поттер и методы рационального мышления" установила рекорд российского краудфандинга" [The book "Harry Potter and the Methods of Rationality" set a record for Russian crowdfunding]. Собака.ru (in Russian). Retrieved 23 October 2018.
  22. ^ a b Кирпанова, Елизавета (6 October 2018). "Здравомыслие в России может привести к инакомыслию" ["Sanity in Russia can lead to dissent"]. Novaya Gazeta (in Russian). Retrieved 23 October 2018.
  23. ^ Neumannová, Edita; Yudkowsky, Eliezer; Matýšek, Jaromír (5 December 2016). "Eliezer Yudkowsky: Harry Potter a metody racionality" [Eliezer Yudkowsky: Harry Potter and the Methods of Rationality]. archetypal.cz (in Czech). Retrieved 1 October 2021.
  24. ^ "哈利波特与理性之道 – 同人小说《哈利波特与理性之道》中文粉丝站点" [Harry Potter and the Methods of Rationality – Fan fiction "Harry Potter and the Methods of Rationality" Fan Site in Chinese]. hpmor.xyz (in Chinese). Retrieved 2 January 2023.
  25. ^ AdrienH (16 April 2011). "Harry Potter et les Méthodes de la Rationalité Chapter 1: Un jour à très faible probabilité, a harry potter fanfic" [Harry Potter and the Methods of Rationality Chapter 1: A Day of Very Low Probability, a harry potter fanfic]. FanFiction.Net (in French). Retrieved 2 January 2023.
  26. ^ Menke, Torben (4 May 2022). "Deutsche Übersetzung (German Translation) von "Harry Potter and the Methods of Rationality" (HPMOR)" [German Translation of “Harry Potter and the Methods of Rationality” (HPMOR)]. GitHub (in German). Retrieved 30 May 2022.
  27. ^ "רציונליות ישראל – "למה אתה מאמין במה שאתה מאמין?"" [Rational Israel - "Why do you believe what you believe?"]. rationality.co.il (in Hebrew). Retrieved 3 March 2021.
  28. ^ geobreed (22 January 2013). "Harry Potter dan Metode Rasionalitas Chapter 1: Suatu Hari Dengan Kemungkinan Amat Kecil, a harry potter fanfic" [Harry Potter and the Methods of Rationality Chapter 1: A Day of Very Low Probability, a harry potter fanfic]. FanFiction.net (in Indonesian). Retrieved 7 June 2023.
  29. ^ "Harry Potter e i metodi della razionalità - Home page" [Harry Potter and the Methods of Rationality - Home page]. Google Sites (in Italian). Retrieved 1 October 2021.
  30. ^ "HPMOR日本語訳" [HPMOR Japanese translation]. Tumblr (in Japanese). Retrieved 1 October 2021.
  31. ^ "Harry Potter og rasjonalitetens metode" [Harry Potter and the Methods of Rationality]. www.hprm.no (in Norwegian). Retrieved 29 September 2021.
  32. ^ Rhaidot (26 July 2013). "Harry Potter y los métodos de la racionalidad Chapter 1: Un día de muy baja probabilidad, a harry potter fanfic" [Harry Potter and the Methods of Rationality Chapter 1: A Day of Very Low Probability, a harry potter fanfic]. FanFiction.Net (in Spanish). Retrieved 1 October 2021.
  33. ^ "Resurser" [Resources]. www.vof.se (in Swedish). Retrieved 18 January 2022.
  34. ^ Кирило, Яценко; Ізмаілова, Ельвіра; Бєлова, Ольга; Володимир, Охрим; Кабакчей, Дмитро. "Гаррі Поттер і Методи Раціональности" [Harry Potter and the Methods of Rationality]. гпімр.укр (in Ukrainian). Retrieved 2 February 2022.

External links[edit]