A peculiarity of Russian speech is accentological norms that native speakers try to observe. But sometimes in conversations there are “cakes”, “rings”, “contracts”, “pamper” or “beautiful” with the wrong stressed syllable. Specialists have up to two hundred "problem" words.
The prevalence of such errors creates a stable basis for their reproduction in speech. Oddly enough, even those who have successfully passed the Russian language exam begin to doubt while listening to a report or news on television or radio. Either they themselves do not remember the rules, or they are mistaken in the interview when, for example, they speak with the wrong emphasis about the most beautiful winter landscapes, images, Christmas trees, decorations ...
Referring to dictionaries and reference books is a good solution. We note that there are words in relation to which there is no single answer even among linguists. Fortunately, the stress in the "most beautiful" (in all cases of this adjective) is fixed and does not raise doubts among specialists.
Degrees of comparison
The comparative degree of the word “beautiful” has two forms. Simple - "more beautiful." Complex - "more beautiful." If we are interested in the style of speech, then the first option is neutral. The second is well suited for scientific articles and documents, since it is clearly of a book character.
Stress in complex form is not a problem. But the stylistically neutral "prettier", which is used in colloquial speech, sometimes causes difficulties. The correct accent in "prettier" falls on the second syllable.
Superlative
The superlative degree does not differ from the comparative one in terms of setting the stress. In the "beautiful" emphasis also falls on the "and".
But here is what you need to pay attention to. There is a simple and compound form in both kinds of degrees. The complex form of superlatives, "the most beautiful," is used in all styles of speech. And the simple one - "beautiful" - is mainly of a book character. So to speak, the opposite is true.
The combination of the word “most” with the superlative adjective that can be found on the pages of 19th-century works is now considered obsolete. Thus, it is impossible to use the word “most beautiful” with the pronoun “most”.
Fixed stress
What prevents to pronounce the words "beautiful, beautiful" with the correct stress? It would seem that a clear fixed emphasis on "and" in the root of "beautiful, beautiful" should help in remembering.
The confusion is probably caused by precisely those words, the emphasis of which is shifted: "smart - smarter - smartest", "strong - stronger - strongest", "kind - kind - kind."
Language is evolving, and norms can change. But now there is no doubt: the words "beautiful - beautiful - beautiful - beautiful - beautiful" have the same emphasis - on the second syllable.
What prevents and what helps to remember
Very often the cinema does not remember the correct stress. The speech characteristics of the characters should reveal the image conceived by the author. But one thing is the movie "Let's Live Until Monday", in which there was an episode with the mistake of a young teacher and the awkward situation associated with it.
Another thing is the numerous films and series, where the characters (positive in every sense) speak some kind of strange “surzhik”, which in reality you will not hear. Incorrect speech "gets stuck" in the memory, unexpectedly floating up in the conversations of children and adults.
Remember the accent of "beautiful, beautiful" rhymes help. Teachers come up with poems where faithful stress is reproduced with ease. For instance:
Beautiful winter -
How they glow at home
Beautiful Christmas trees -
Green needles.
It would be nice to repeat a series of words with a fixed stress on the second syllable, which is heard distinctly. These rhymes come in handy for composing new poems. For example, "the happiest, the funniest, the most playful, the grouchy" ...
Yes, and once again decline on the case: "the most beautiful, the most beautiful, the most beautiful, the most beautiful" ...