EPIN (Extended Piece Identifier Notation) implementation for Ruby. Extends PIN by adding a derivation marker to track piece style in cross-style abstract strategy board games with a minimal compositional API.

A Ruby implementation of GAN (General Actor Notation) v1.0.0 specification for identifying game actors in abstract strategy board games. GAN combines Style Name Notation (SNN) and Piece Identifier Notation (PIN) with a colon separator to provide complete, unambiguous piece identification. Represents all four fundamental piece attributes: Type, Side, State, and Style. Enables cross-style gaming, immutable transformations, and component extraction with to_pin/to_snn methods. Built on sashite-snn and sashite-pin gems.

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.