FEEN (Field Expression Encoding Notation) provides a universal, rule-agnostic format for representing board game positions. This gem implements the FEEN Specification v1.0.0 with a modern Ruby interface featuring immutable position objects and functional programming principles. FEEN extends tradi...

Parse and generate Portable Action Notation (PAN) strings for representing atomic actions in abstract strategy board games including chess, shogi, xiangqi, and others. PAN provides an intuitive operator-based syntax with six core operators: "-" (move to empty square), "+" (capture), "~" (special ...