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glthr.com

Essays and investigations by Guillaume Lethuillier: puzzles, ciphers, languages, artificial intelligence, and the inner workings of video games from the past.

2026

  1. Why XML Tags Are so Fundamental to ClaudeAnd What That Tells Us About Language Delimiters in Languages
  2. The Riven DiffsSeeing Riven (1997) Differently Riven

2025

  1. Formulaic Delimiters in The Iliad and The Odyssey Delimiters in Languages
  2. The Riven (1997) NavigatorA New Way to Explore the Original Riven Riven
  3. Model Collapse and the Need for Human-Generated Training Data
  4. The Myst Graph, 3: Creating the Graph Using DeMystify The Myst Graph
  5. The Myst Graph, 2: Revealing New Findings The Myst Graph
  6. The Myst Graph: A New Perspective on Myst The Myst Graph
  7. Discovering Errors in Donald Knuth’s TAOCP
  8. LLM Delimiters and Higher-Order Expressions Delimiters in Languages

2024

  1. Solving “Knight Moves 6” (Jane Street Puzzle, October 2024) Jane Street Puzzles
  2. First-Order, Second-Order Expressions, and Delimiters in Languages Delimiters in Languages
  3. Solving “Number Cross 4” (Jane Street Puzzle, May 2024) Jane Street Puzzles
  4. A Fresh Perspective on Kryptos K4, the Decades-Old Unsolved CodeA Promising Pattern That May Reveal a Distinctive Encryption Technique

2023

  1. Contextual Yet Non-Descriptive ErrorsProposal for Automatically Generated Error Codes

2022

  1. Second-Order Constraints in Constraint-Logic Games