+typedef struct _ttt_board ttt_board_t;
+
+void
+ttt_board_init (ttt_board_t *board);
+
+void
+ttt_board_init_from_string (ttt_board_t *board,
+ const char *s);
+
+char *
+ttt_board_to_string (ttt_board_t *board);
+
+void
+ttt_board_write (ttt_board_t *board, FILE *file);