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Chess in SQL

This technical demonstration showcases how to implement a rudimentary Chess game entirely within SQL. By leveraging standard SQL DDL and DML, the author defines a board, places pieces, and even executes simple moves. It's a clever, if impractical, exploration of SQL's surprising capabilities beyond data storage and retrieval.

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Apr 1, 5:00 AM
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Apr 1, 7:00 PM
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The Lowdown

The article presents a fascinating, pure SQL implementation of a Chess board, demonstrating how a relational database can represent game state and even execute basic moves. This showcases the often-underestimated flexibility of SQL for tasks far removed from typical data management.

  • Board Representation: A board table is created with rank, file, and piece columns, where pieces are represented by Unicode emoji.
  • Initial Setup: The board is populated with all Chess pieces in their standard starting positions using INSERT statements.
  • Making Moves: Two basic pawn moves (e2-e4 and e7-e5) are simulated using DELETE and INSERT statements to update piece positions.
  • Board Visualization: A complex SELECT query, utilizing WITH clauses and conditional aggregation (MAX(CASE WHEN ... END)), is used to construct and display the 8x8 Chess board, including empty squares represented by a '·' character.

This exercise highlights the declarative power of SQL, proving that with enough ingenuity, one can model and manipulate complex systems, even game states, directly within the database engine.