sashite-cgsn

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

CGSN (Chess Game Status Notation) provides a rule-agnostic taxonomy of observable game status values for abstract strategy board games. This gem implements the CGSN Specification v1.0.0 with a minimal Ruby interface featuring immutable status objects and functional programming principles. CGSN defines standardized identifiers for terminal conditions (checkmate, stalemate, bare_king, mare_king, insufficient), player actions (resignation, agreement, illegal_move), and temporal constraints (time_limit, move_limit, repetition), enabling precise and portable status identification across multiple games and variants. Perfect for game engines, notation systems, and hybrid gaming platforms requiring consistent, rule-agnostic game state representation.