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STN (State Transition Notation) provides a rule-agnostic format for describing state transitions
in abstract strategy board games. This gem implements the STN Specification v1.0.0 with a modern
Ruby interface featuring immutable transition objects and functional programming principles. STN
captures net changes between game positions by recording modifications in piece locations, hand/reserve
contents, and active player status using standardized CELL coordinates and QPI piece identification.
Perfect for game engines, position diff tracking, undo/redo systems, and network synchronization
requiring efficient state delta representation across multiple game types and traditions.
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