ply_enrich_batch        Enrich a batch of positions with chess features
ply_fen_parse           Parse a FEN string into a ChessState list
ply_fen_serialize       Convert a ChessState list back to a FEN string
ply_game_accept_draw    Accept an outstanding draw offer in a managed
                        game
ply_game_cancel         Cancel a waiting managed game
ply_game_count          Return the number of games currently held in
                        the registry
ply_game_fen            Get the current FEN for a managed game
ply_game_history        Get the full ply history of a managed game as
                        UCI strings
ply_game_info           Get metadata for a managed game
ply_game_init           Return a ChessState list at the standard
                        starting position
ply_game_join           Join an existing game as the opposing player
ply_game_move           Make a move in a managed game by UCI string
ply_game_new            Create a new managed game
ply_game_new_from_fen   Create a new managed game from a custom
                        starting position
ply_game_offer_draw     Offer or toggle a draw in a managed game
ply_game_reset_registry
                        Reset (clear) the global game registry
ply_game_resign         Resign a managed game
ply_hash                Compute a Zobrist-style position hash
ply_in_check            Test whether a side is in check
ply_is_checkmate        Test whether the position is checkmate
ply_is_insufficient_material
                        Test whether the position is a draw by
                        insufficient material
ply_is_stalemate        Test whether the position is stalemate
ply_legal_moves         List all legal moves from a position as UCI
                        strings
ply_move_apply          Apply a UCI move string to a position
ply_pgn_extract_movetext
                        Extract clean SAN movetext tokens from a PGN
                        game block
ply_pgn_load_games      Load a PGN file and return a data.frame of
                        game-level metadata
ply_pgn_parse_tags      Parse PGN tag pairs from a raw game block
ply_validate            Validate a position (piece counts, king count,
                        etc.)
