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From Harry Potter and The Half Blood Prince we can know that Voldemort wished to make 7 Horcruxes. But we know that Voldemort's 7 Horcruxes included Harry. But as this was unintentional, Voldemort didn't know about this.

Then why didn't Voldemort try to make a seventh Horcrux?

Nog Shine
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iamgroot
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    By the time Harry had a part of Voldemort's soul, the latter wouldn't be able to create another Horcrux, wouldn't he? ;) – Gallifreyan Apr 09 '18 at 08:40
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    Since this is more about fantasy then about the movie, this perhaps should be moved to http://scifi.stackexchange.com/? – willeM_ Van Onsem Apr 09 '18 at 14:33
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    Didn't Voldemort (his original body) perish while attempting to kill Harry? So even if he did want to create another Horcrux (answers notwithstanding), he was kind of out of the picture at that point, yes? – Jesse C. Slicer Apr 09 '18 at 16:36
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    @WillemVanOnsem this question already has an answer there, so it would be a duplicate. Also note that just because it might be a better fit on another site, that doesn't make it off-topic for this one. – JAD Apr 10 '18 at 08:27
  • @JAD: no agreed, but that is problably the unfortunate part of multiple networks: that questions can not be shared among the networks and thus we create a lot of duplicates :( – willeM_ Van Onsem Apr 10 '18 at 08:28
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    @WillemVanOnsem yep, happens a lot, especially with Harry Potter and Game of Thrones – JAD Apr 10 '18 at 08:29
  • @gallifreyan [citation needed] – Mindwin Remember Monica Apr 10 '18 at 12:45
  • @WillemVanOnsem an answer here can include the answer on SciFi.StackExchange, that is the beauty of the StackExchange Network. this site can look at it from another point of view that SciFi may not look at. – Malachi Apr 10 '18 at 14:57
  • the initial comments thread is always one person complaining about the question, and then a big debate over the merit of the complaint. meanwhile everyone else is trying to answer it below. – NOP Apr 10 '18 at 23:42

4 Answers4

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He wanted to split his soul into 7 pieces, not create 7 Horcruxes. The difference here is that the soul in his body counts as one piece, so you only need 6 Horcruxes.

As we can see Voldemort say in The Halfblood Prince:

Wouldn't it be better, make you stronger, to have your soul in more pieces, I mean, for instance, isn't seven the most powerfully magical number, wouldn't seven - ?

JAD
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    Classic off-by-one error. – ShreevatsaR Apr 07 '18 at 22:20
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    This also has the implication that he might only have failed because his soul was in 8 parts instead of 7. – Pharap Apr 08 '18 at 00:14
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    @Pharap If he split his soul into eight pieces and one was destroyed, does that count as seven – jkd Apr 08 '18 at 00:45
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    @jakekimdsΨ no because then its not one soul split seven ways but seven eighths soul split seven ways – tox123 Apr 08 '18 at 02:47
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    @ShreevatsaR People so often forget that Horcruxes are stored in zero-indexed arrays. – Janus Bahs Jacquet Apr 08 '18 at 15:53
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    @jakekimdsΨ there was a question on the Sci Fi & Fant SE asking exactly whether the ratios were exponential or factorial — something like that. search for it if you care. – can-ned_food Apr 09 '18 at 01:54
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    @ShreevatsaR I'd go one step further and classify it as an off-by-one-who-lived error :) – Kaithar Apr 09 '18 at 09:43
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    @Kaithar https://bit.ly/199BwKr – Kevin Apr 09 '18 at 12:19
  • once one of the horcruxes is destroyed then the soul is no longer split into 7 pieces, right? the book was destroyed in one of the movies and that was supposed to be one of the horcruxes. just something to keep in mind while talking about the horcruxes and their quantity – Malachi Apr 10 '18 at 15:00
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You made the same mistake as Harry in Harry Potter and The Half Blood Prince. As JAD said, Voldemort wanted to split his soul in seven, not create seven Horcruxes (emphasis mine):

“[...] You heard him, Harry: ‘Wouldn’t it be better, make you stronger, to have your soul in more pieces... isn’t seven the most powerfully magical number...’ Isn’t seven the most powerfully magical number. Yes, I think the idea of a seven-part soul would greatly appeal to Lord Voldemort.”

“He made seven Horcruxes?” said Harry, horror-struck, while several of the portraits on the walls made similar noises of shock mid outrage. “But they could be anywhere in the world — hidden — buried or invisible —”

“I am glad to see you appreciate the magnitude of the problem,” said Dumbledore calmly. “But firstly, no, Harry, not seven Horcruxes: six. The seventh part of his soul, however maimed, resides inside his regenerated body. [...]”

Stevoisiak
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Julien Lopez
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Voldemort wanted a 7 piece soul, with the main piece staying inside his body (hence 6 horcruxes in total)

Dumbledore had guessed (in the book at least, not sure if this is mentioned in the movie, see here) that Voldemort intended to create his 6th horcrux when he attacked Harry, but got destroyed himself

However, Voldemort did create his 6th and final horcrux later on (sometime between Prisoner of Azkaban and Goblet of Fire), Nagini

user13267
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-1

He always wanted to create 6 (to split his soul into 7). Before killing Harry's parents at Godric's hollow, he had created 5 (diary, ring, locket, cup, diadem). Harry was the 6th, but Volde didn't know that. So after his remaining soul fragment went from body to body, in 1994 he was made a homunculus by Pettigrew (rudimentary body like a baby). After in that baby form, the same year, he found Nagini and made her a horcrux. He thought it was the 6th, when actually it was the 7th. Finally splitting his soul into 8.

In conclusion, he always intended to make 6, always thought he made 6. Voldemort never realised he had made 7.

Sinedstro Cythan
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    Your answer contradict the accepted one and seems wrong given the elements provided by the accepted one. Maybe you could edit to solve this ? Add quotes and sources to your point ? – M.Polo Mar 22 '21 at 23:16