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FEEN (Forsyth—Edwards Enhanced 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 traditional FEN notation to support multiple game systems (chess,
shōgi, xiangqi, makruk), cross-style games, multi-dimensional boards, and captured pieces
held in reserve. Built on EPIN (piece notation) and SIN (style notation) foundations,
FEEN enables canonical position representation across diverse abstract strategy board games.
Perfect for game engines, position analysis tools, and hybrid gaming systems requiring
comprehensive board state representation.
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