Quote Originally Posted by radomir View Post
It is just phonetic? . Let's see: хорошó , хaрошó, хaрaшó or хорaшó ? And with some other vowels one could find also some cases of ambiguity. There is place for some rules, with unstressed vowels but... of course it is of no use for Russian speaking people.
Thank you.
I was answering your specific question about "в or б; и or ы":
Really there is no additional rule for helping where в or б; и or ы must be used apart from this last case for г. х. ж ?

That is why I explained some spelling rules of и/ы (after ш, ж, and after ц), and then added: "In all other cases, it is just phonetic." (it was written referring to и and ы).
There was nothing about unstressed vowels in your original question.

BTW, I did not understand what you meant by "apart from this last case for г. х. ж"? I.e., I did not get what was the issue with г, х, ж?