Huarong Dao Rules: A Sliding-Block Puzzle Explained
A plain-English guide to Huarong Dao rules, the board, the Cao Cao escape goal, and why empty space matters.
Updated 2026-05-26Read article
Eastern Puzzle ArchiveJournal
Editorial essays connect classical puzzles to modern mathematical ideas.
Read focused essays for search and sharing, then follow the companion library guides for deeper source-backed context.
Nine Linked Rings Move Sequence and Gray Code
A plain-English guide to the Nine Linked Rings move sequence, Gray code, and why each legal move changes one readable state.
Updated 2026-05-26Read articleTangram Geometry: Area, Symmetry, and Dissection
A source-backed guide to the geometry behind Tangram: fixed area, 45-degree pieces, symmetry, and dissection.
Updated 2026-05-26Read articleHuarong Dao as a State-Space Puzzle
How a Chinese sliding-block puzzle turns a compact board into a graph of states, paths, and shortest solutions.
Updated 2026-05-20Read articleNine Linked Rings and Binary Thinking
How a classic Chinese ring puzzle turns legal moves into state notation, recursion, and move-count formulas.
Updated 2026-05-20Read articleWhat Is a Tangram?
A source-backed introduction to the seven-piece Chinese shape puzzle and the geometry that makes it more than a toy.
Updated 2026-05-20Read articleLibrary companions
Continue from essays into structured guides.
Tangram Mathematics
A source-backed path into dissection geometry, topology, graph thinking, and area-preserving transformations.
Read guideNine Linked Rings as a Sequence System
A bridge from a traditional mechanical puzzle to binary-like state notation and recursive solving.
Read guideHuarong Dao and Sliding-Block Search
A source-backed guide to Huarong Dao as a Chinese sliding-block puzzle and a natural route into state-space exploration.
Read guide