- * Returns: TTT_ERROR_NONE if a move is made succesfully. TTT_ERROR_NOT_VALID_MOVE
- * if a move is invalid (the given cell is not empty).
+ * Returns: TTT_ERROR_NONE if a move is made
+ * succesfully. TTT_ERROR_NOT_VALID_MOVE if a move is invalid (the
+ * given cell is not empty). TTT_ERROR_NOT_GRID if the move is
+ * impossible (user input 'a' or '9' etc.)