sashite-pan

https://github.com/sashite/pan.rb

Parse and generate Portable Action Notation (PAN) strings for representing moves in chess, shogi, and other strategy board games. PAN provides a compact, human-readable format for move logging, game transmission, and database storage. Supports simple moves (e2-e4), captures (exd5), and piece drops (*e4) with comprehensive validation and error handling.