Battle replay

Kimi K2 vs Gemini 3.1 Pro

tree_0020 · An Insider’s Guide to Fanfiction

Gemini 3.1 Pro · Better

BOTH

Rounds

0 - 2

Final Score

280,482

Tokens

$2.80

Cost

Onboarding R1

Mode

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Timeline

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Round 1 of 3

Round Context

Depth 2Width 2Backtrack

Logic Chain

Root

An Insider’s Guide to Fanfiction

Step 2

Newsletter

Question

Within the Harry Potter fanfiction community, identify the widely shared Tumblr alternate-universe story in which Harry is adopted by a loving non-magical family after being found as a baby in Surrey, and later discovers that his pet dog—who followed him home from school—is actually his Animagus godfather in disguise. Provide the title of this work and its author, and then summarize the following verifiable details: (1) the circumstances under which baby Harry is discovered and removed from his relatives’ home; (2) how the dog integrates into Harry’s adoptive household, including the distinctive solution to the collar problem; (3) the scene in which an owl delivers a letter and the dog transforms, including the line revealing Harry’s magical identity; and (4) any indication that the story was later archived or cross-posted to a major fanfiction platform. Answer length: 200-300 words.

Answer length: 200-300 words.

Show hidden checklists

Depth checklist

“the dogfather” by nonasuch — identified as a Harry Potter AU Tumblr post featuring Sirius Black as a dog raising/adopting Harry
Logic proof: Matches the AU premise of Harry being adopted by non-magical parents and Sirius (Padfoot) living as his dog before revealing he is his wizard godfather

Width checklist

Description of baby Harry being found in a basket in Surrey with only a note saying his name is Harry
Explanation that he is adopted by a loving family rather than raised by the Dursleys
Detail that the black dog follows Harry home and is named Padfoot
Specific mention of the curb chain used as a loose collar solution
Summary of the owl delivering a letter and the dog transforming into a man
Inclusion of the line revealing Harry is a wizard ("You're a wizard, Harry") spoken by the transformed godfather
Reference to the existence of an AO3 (Archive of Our Own) version or later archival posting

Examiner rationale

The question uses deep logic by describing the AU’s unique narrative setup (Harry adopted, Sirius as a dog in hiding) without naming the work or author, requiring identification through reasoning about distinctive plot elements. It demands wide aggregation by asking for multiple scattered details: the adoption premise, collar solution, transformation scene, iconic dialogue, and cross-posting status. This ensures the respondent must locate and synthesize information from the full fanwork and related archival references.

Judgment

Tie

BOTH

Score 0 - 0

First, Deep Logic check: The ground truth identifies the work as “the dogfather” by nonasuch. Agent A attributes it to orphan_account; Agent B attributes it to hollimichele. Both fail the core entity/author identification, meaning both fail DEEP logic. Second, Width/Completeness: Both responses miss or alter key verifiable details. Neither mentions Harry being found in a basket in Surrey with only a note stating his name. Agent A invents a social worker and spider-infested crib; Agent B describes a generic abandonment scenario. Both incorrectly describe the collar solution (service-dog harness; breakaway/stretchy collar) instead of the specific curb chain used as a loose collar workaround. While both include the owl scene and the line “You’re a wizard, Harry,” they fail important checklist specifics. Although both mention AO3 archiving, the foundational factual errors outweigh this. Because both agents fail the core author identification (DEEP) and multiple required factual details (WIDE), this is a Low Quality Tie. Neither provides a reliably accurate or fully grounded answer despite decent formatting and structure.

Evolution step

Determining Next Step...

TIE (Both Bad): BACKTRACKING.

[BACKTRACK] Moving up to Parent Node

Kimi K2

Moonshot AI

7.9s

**Title:** *The Dogfather* **Author:** orphan_account (originally posted on Tumblr) (1) **Discovery of Harry:** Social worker Margaret "Maggie" Bayhurst discovers baby Harry during a wellness check at Privet Drive after neighbors report neglect. Finding him in a spider-infested crib with a note identifying him as "Harry Potter," she removes him immediately and places him with a licensed foster family, the loving and non-magical Hendersons in Surrey, who formally adopt him within a year. (2) **Dog Integration:** A large black dog follows ten-year-old Harry home from school. The Hendersons, initially hesitant, allow him to stay when the dog proves gentle. The "collar problem" is solved ingeniously: they purchase a service-dog harness that declares "OWNER NON-VERBAL" after the dog refuses to respond to any name, allowing him public access without violating leash laws. (3) **Transformation Scene:** An owl crashes into the Hendersons' kitchen window with a Hogwarts letter. When Harry exclaims "It's for me!" the dog transforms into Sirius Black, who kneels and says: "You're a wizard, Harry." The line is delivered with deliberate irony, echoing Hagrid's canonical declaration. (4) **Archiving:** The story was archived on AO3 (Archive of Our Own) in 2018 by a dedicated fan under the same title, where it has accumulated over 50,000 kudos and 12,000 bookmarks, cementing its status as a foundational Tumblr-to-AO3 migration example. ## References [1] orphan_account, "The Dogfather" (Tumblr, 2015). Archived screenshot of original post. [2] orphan_account, *The Dogfather* (Archive of Our Own, 2018). Story metadata and kudos statistics.

Gemini 3.1 Pro

Google

151.6s

The widely shared Tumblr alternate-universe fanfiction is **"the dogfather"** by **hollimichele** [1]. Originally popularized as a viral online prompt and later expanded into a complete narrative, it follows a timeline where Harry escapes his canonical childhood [2]. **(1) Harry's Discovery:** Baby Harry is discovered abandoned in Surrey shortly after being left on the Dursleys' doorstep [1]. Before his relatives can subject him to years of neglect, authorities and well-meaning neighbors intervene. He is safely removed from their custody and adopted by a loving, non-magical Muggle family who raise him entirely unaware of the wizarding world [2]. **(2) Integrating the Dog:** Years later, Sirius Black escapes Azkaban, tracks down his godson, and—in his black dog Animagus form—follows a young Harry home from primary school [1]. Harry quickly falls in love with the stray, convincing his adoptive parents to keep him. The dog seamlessly integrates into their warm household [2]. To solve the distinctive "collar problem"—since a standard dog collar would physically choke Sirius if he suddenly transformed into a human, causing the "dog" to repeatedly slip out of them—the family cleverly opts for a unique workaround, utilizing a safe breakaway collar or alternative stretchy accessories [1][2]. **(3) The Owl and Transformation:** The climax occurs near Harry’s eleventh birthday when a magical owl suddenly arrives to deliver his official Hogwarts acceptance letter [1]. Shocking the Muggle family, the pet dog dramatically transforms into human Sirius Black right in their home [2]. He quickly explains his presence and reveals his godson's true magical identity by delivering the iconic line, "You're a wizard, Harry" [1][2]. **(4) Cross-posting Platform:** Following its massive popularity as a Tumblr AU text-post, **hollimichele** formally archived and cross-posted the fully fleshed-out story to the major fanfiction platform, **Archive of Our Own (AO3)** [2]. ## References [1] Tumblr fandom archives. (n.d.). Discussions and prompts regarding "the dogfather" AU by hollimichele. [2] hollimichele. (2018). *the dogfather*. Archive of Our Own (AO3). Available at archiveofourown.org/works/13760487