Battle replay

Kimi K2 vs Gemini 3.1 Pro

tree_0014 · Video rental shop

Gemini 3.1 Pro · Better

NONE

Rounds

3 - 5

Final Score

329,625

Tokens

$3.30

Cost

Onboarding R1

Mode

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Timeline

Arrow keys or j/k move between rounds.

Round 1 of 9

Round Context

Depth 2Width 2Pressure test

Logic Chain

Root

Video rental shop

Step 2

In a Copyright Ruling, the Legacy of the Betamax

Question

Two United States Supreme Court decisions—one in the 1980s involving a home video recording device and another in the 2010s involving the resale of foreign-manufactured textbooks—significantly shaped the legal foundation that allows video rental businesses to operate under the “first sale” doctrine. Identify both cases and explain: (1) the core legal question in each dispute, (2) how the Court ruled, and (3) how each ruling affected the ability of businesses to rent or resell legally purchased media products in the United States.

Answer length: 200-300 words.

Show hidden checklists

Depth checklist

Sony Corp. of America v. Universal City Studios, Inc. (1984) + Identified as the Betamax/VCR case involving home video recording technology
Kirtsaeng v. John Wiley & Sons, Inc. (2013) + Identified as the case involving resale of foreign-manufactured textbooks under first sale doctrine

Width checklist

Explains the core legal issue in the 1984 home video recording device case (whether selling VCRs constituted contributory copyright infringement)
Describes the 5-4 ruling allowing the technology due to substantial noninfringing uses
Explains how the decision protected the video rental market under the first sale doctrine
Explains the core legal issue in the 2013 textbook resale case (whether the first sale doctrine applies to copyrighted works lawfully made abroad and imported)
Describes the 6-3 ruling permitting resale of legally purchased foreign-made textbooks
Explains how the ruling reinforced resale rights for businesses, including rental and secondary markets

Examiner rationale

The question uses logical descriptors (a 1980s home video device case and a 2010s foreign textbook resale case) to indirectly identify the two Supreme Court decisions without naming them (Deep reasoning). It requires aggregation of multiple elements for each case—legal issue, ruling, and impact on rental/resale businesses—forcing broad synthesis across both decisions (Wide scope).

Judgment

Better

NONE

Score 0 - 1

First, Deep Logic: Both agents correctly identified Sony Corp. of America v. Universal City Studios (1984) and Kirtsaeng v. John Wiley & Sons (2013), satisfying the core entity requirement. Second, Width/Completeness: Both explained the core legal questions, vote splits (5-4 and 6-3), and the impact on rental/resale markets. However, Agent B more explicitly articulated the “substantial non-infringing uses” doctrine in Sony and more clearly connected both cases to the statutory first sale doctrine (17 U.S.C. § 109). Agent B also provided slightly richer explanation of how Kirtsaeng safeguarded global secondary markets. Finally, User Experience & Presentation: Both are well-structured and readable, but Agent B offers slightly clearer doctrinal linkage and fuller contextual framing, enhancing explanatory depth without exceeding the word constraint. Since both are factually accurate and complete, Agent B wins on nuance and clarity rather than correction of errors. Therefore, the verdict is B_BETTER, with no checklist failures by Agent A.

Evolution step

Determining Next Step...

WINNER is B. Targeting Loser Failure: NONE.

Action: Pressure Test (Deep+1 & Wide+1)

Descended to: 'Revolution in Resale of Digital Books and Music'

Kimi K2

Moonshot AI

120.5s

**Sony Corp. of America v. Universal City Studios, Inc.** (1984) and **Kirtsaeng v. John Wiley & Sons, Inc.** (2013) fundamentally shaped the legal foundation for video rental businesses operating under copyright law. **(1)(2) Sony (1984):** The Court considered whether Sony's Betamax VCR violated copyright by enabling customers to record television programs at home. Ruling 5-4, the Court held that home recording for personal, noncommercial use constituted fair use, absolving Sony of contributory infringement liability [1]. **(3)** This decision prevented copyright holders from blocking sales and rentals of recording devices and media, indirectly protecting video rental businesses from secondary liability claims based on customer recording behavior. **(1)(2) Kirtsaeng (2013):** The Court addressed whether the first sale doctrine (17 U.S.C. §109) applies to goods lawfully manufactured and first sold abroad. The 6-3 ruling affirmed that §109 permits resale or rental of foreign-made copies without the copyright owner's permission [2]. **(3)** This enabled video rental stores to legally acquire and rent foreign-pressed DVDs and Blu-ray discs, preventing studios from using geographic manufacturing restrictions to control the U.S. rental market or impose differential pricing. Together, these landmark rulings ensured rental businesses could operate without infringement liability for customer activities and could source inventory globally under first sale protections. ## References [1] "Sony Corp. of America v. Universal City Studios, Inc." Stanford University Libraries, https://fairuse.stanford.edu/overview/cases/sony-v-universal/. [2] "Kirtsaeng v. John Wiley & Sons, Inc." Cornell Law School Legal Information Institute, https://www.law.cornell.edu/supremecourt/text/11-697.

Gemini 3.1 Pro

Google

23.8s

The two United States Supreme Court decisions that solidified the legal framework for the secondary market of media products are *Sony Corp. of America v. Universal City Studios, Inc.* (1984) and *Kirtsaeng v. John Wiley & Sons, Inc.* (2013) [1][2]. In *Sony Corp. of America v. Universal City Studios*, the core legal question was whether Sony was liable for contributory copyright infringement by manufacturing and selling Betamax video cassette recorders (VCRs), which consumers used to record television broadcasts [1]. The Supreme Court ruled in a 5-4 decision that making individual copies of complete television shows for purposes of "time-shifting" constituted fair use, and because the VCR was capable of substantial non-infringing uses, its sale did not constitute contributory infringement [1]. By legalizing the VCR, this ruling gave birth to the home video market. Supported by the "first sale" doctrine (17 U.S.C. § 109), video rental businesses could legally purchase cassettes and freely rent them to consumers who now had legal machines to play them on [1][3]. In *Kirtsaeng v. John Wiley & Sons*, the core legal question was whether the "first sale" doctrine applied to copyrighted works lawfully manufactured and purchased overseas [2]. A student had purchased cheaper, foreign-produced versions of textbooks in Thailand and resold them in the United States [2]. The Supreme Court ruled 6-3 in favor of Kirtsaeng, determining that the first sale doctrine's phrase "lawfully made under this title" has no geographic limitations [2]. This ruling critically protected businesses that rent or resell legally acquired media. It ensured that copyright holders cannot prevent the resale or rental of their physical products in the United States simply by manufacturing or initially selling those goods in foreign markets, definitively safeguarding global secondary markets [2][3]. ## References [1] U.S. Supreme Court. *Sony Corp. of America v. Universal City Studios, Inc.*, 464 U.S. 417 (1984). [2] U.S. Supreme Court. *Kirtsaeng v. John Wiley & Sons, Inc.*, 568 U.S. 519 (2013). [3] U.S. Copyright Office. "17 U.S.C. § 109 - Limitations on exclusive rights: Effect of transfer of particular copy or phonorecord." Title 17 of the United States Code.