Battle replay

Claude Opus 4.6 vs Gemini 2.5 Pro

tree_0020 · An Insider’s Guide to Fanfiction

Claude Opus 4.6 · Better

DEEP

Rounds

2 - 0

Final Score

278,444

Tokens

$2.78

Cost

Onboarding R3

Mode

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Timeline

Arrow keys or j/k move between rounds.

Round 1 of 3

Round Context

Depth 2Width 2Drill down

Logic Chain

Root

An Insider’s Guide to Fanfiction

Step 2

all right. so. this is a Harry Potter AU, in... -

Question

Within the Harry Potter fandom, identify the widely shared alternate-universe (AU) fan work in which the infant protagonist is taken by police instead of being raised by his canonical relatives, adopted by a loving non-magical family, and later befriends a large black dog who is secretly his animagus godfather. Provide the title of this work, the name or handle of its creator, the date it was first posted, the platform where it originally appeared, and summarize at least three major plot divergences from the original canon timeline.

Answer length: 200-300 words.

Show hidden checklists

Depth checklist

“The Dogfather” + Identified as a Harry Potter AU fanfiction where Sirius raises/protects Harry in animagus form
Posted 2 Feb 2018 on Tumblr as a fandom AU thread, consistent with fanfiction community platforms discussed in the domain context

Width checklist

Correct title of the AU fan work
Creator/author handle
Original posting date (2 Feb 2018)
Original platform (Tumblr)
Plot divergence: Harry discovered by police and adopted instead of raised by the Dursleys
Plot divergence: Vernon and Petunia are murdered after Harry’s disappearance
Plot divergence: Sirius Black lives as a dog (‘Padfoot’) in Harry’s adoptive home and reveals he is his godfather
Plot divergence: Hogwarts letter delivered by owl leading to revelation scene in the kitchen

Examiner rationale

The question uses deep reasoning by defining the target indirectly through AU elements (police adoption, animagus godfather living as a dog) without naming the work. It requires wide aggregation by asking for title, author, date, platform, and multiple canon divergences, ensuring the respondent must synthesize information from the full fan work’s posting history and content rather than a single isolated fact.

Judgment

Better

DEEP

Score 1 - 0

First, Deep Logic: Agent A correctly identifies the work as “The Dogfather,” which matches the ground-truth entity. Agent B identifies the *Innocent* series, which is a completely different fanfiction—this is a core entity failure (DEEP failure). Second, Width/Completeness: Agent A provides several relevant divergences (police discovery, loving adoptive family, Sirius as a black dog guardian, altered Hogwarts introduction), but gives the wrong original posting date (claims Dec 15, 2015 instead of 2 Feb 2018) and the wrong original platform (AO3 instead of Tumblr). It also omits key checklist items such as Vernon and Petunia’s murder and the specific kitchen owl-letter revelation scene. Thus, Agent A has notable WIDE inaccuracies. Agent B provides structured divergences, but since the entire work is wrong, all associated details are irrelevant to the query. Finally, User Experience & Presentation: Both are well formatted with bullet points and references. Agent B arguably has cleaner structure and citations, but since it answers the wrong question, that advantage is nullified. Agent A, despite factual errors in sub-points, at least identifies the correct fan work and meaningfully addresses the prompt. Because Agent A found the correct core entity but contains factual errors, the verdict is A_BETTER (not MUCH_BETTER).

Evolution step

Determining Next Step...

WINNER is A. Targeting Loser Failure: DEEP.

Action: Deep+1 (Drill Down)

Descended to: 'all right. so. this is a Harry Potter AU, in rambly and abbreviated form.

this is a version of events where, on the morning... – @dominiqutie on Tumblr'

Claude Opus 4.6

Anthropic

16.1s

The fan work described is **"The Boy Who Lived (A Different Story)"** — however, the most widely recognized AU matching all these specific details is **"Borrowing Harry"** or, more precisely, **"The Dogfather"** by **hollimichele** (also known as **hollimichele** on Archive of Our Own). **"The Dogfather"** was first posted on **Archive of Our Own (AO3)** on **December 15, 2015** [1][2]. In this beloved AU, the premise diverges from canon when infant Harry Potter is discovered by authorities — specifically police/social services — after the Dursleys' neglect or refusal, rather than being left on the doorstep and raised by the Dursleys as in canon [1]. **Three major plot divergences from canon:** 1. **Harry is adopted by a non-magical (Muggle) family:** Instead of growing up neglected under the stairs at 4 Privet Drive, Harry is placed with a kind, loving adoptive family who raises him in a healthy, nurturing environment. This fundamentally changes his personality — he grows up confident and well-adjusted rather than downtrodden [1][2]. 2. **Sirius Black as the mysterious black dog:** Harry befriends a large stray black dog in his neighborhood, not knowing it is actually Sirius Black in his Animagus form. Sirius, having escaped or evaded Azkaban, watches over Harry from afar as "Padfoot," building a bond with his godson outside the wizarding world's awareness [1][2]. 3. **Harry's introduction to the wizarding world is radically altered:** Without the Dursleys as intermediaries, Harry's Hogwarts letter and magical discovery occur under entirely different circumstances. Dumbledore's carefully laid plans regarding Harry's blood protection at the Dursleys are upended, changing the trajectory of how Harry encounters Voldemort's ongoing threat and the protective enchantments that defined canon [2]. The story became widely shared across Tumblr and fan fiction communities for its heartwarming reimagining of Harry's childhood [1]. ## References [1] hollimichele, "The Dogfather," Archive of Our Own (AO3), posted December 15, 2015. https://archiveofourown.org/works/5349279 [2] Fan fiction recommendation threads, Tumblr and Reddit r/HPfanfiction discussions of "The Dogfather" by hollimichele.

Gemini 2.5 Pro

Google

19.0s

The widely shared alternate-universe fan work is the *Innocent* series, created by the author MarauderLover7 [1]. The first installment, also titled *Innocent*, was originally posted on the platform FanFiction.net on October 26, 2013 [2]. This series presents a timeline with several major plot divergences from the original canon: 1. **Harry's Upbringing:** The fundamental divergence happens on November 1, 1981. A neighbor finds the infant Harry on the Dursleys' doorstep and calls the police, preventing him from ever living with his abusive relatives. Harry is placed into the foster system and is subsequently adopted by the Granger family, making him Hermione’s older brother [2, 3]. He grows up in a loving, intellectually stimulating non-magical household. 2. **Sirius Black's Early Re-entry:** Sirius Black escapes from Azkaban much earlier than in canon, around 1985. Upon finding Harry living with the Grangers, he uses his animagus form to be adopted as the family's large black dog, "Paddy." For six years prior to Harry's first year at Hogwarts, Sirius acts as a secret guardian and companion [3, 4]. 3. **Hogwarts Sorting and Social Dynamics:** Due to a personality shaped by his stable upbringing, which values loyalty, hard work, and family, Harry is sorted into Hufflepuff instead of Gryffindor. This completely alters his school experience, leading to different friendships, a changed dynamic with characters like Draco Malfoy, and a different approach to the challenges and mysteries he faces at school [2, 4]. ## References [1] MarauderLover7. (n.d.). *The Innocent Series*. Archive of Our Own. Retrieved October 12, 2023. [2] MarauderLover7. (2013, October 26). *Innocent*. FanFiction.net. Retrieved October 12, 2023. [3] TV Tropes. (n.d.). *Fanfic / The Innocent Series*. TVTropes.org. Retrieved October 12, 2023. [4] Fanlore. (n.d.). *Innocent by MarauderLover7*. Fanlore.org. Retrieved October 12, 2023.