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...

QPI (Qualified Piece Identifier) implementation for Ruby. Provides a rule-agnostic format for complete piece identification in abstract strategy board games by combining SIN and PIN primitives, with Native/Derived relationship support.