OK, here I bring first results. I can talk about 2 URLs yet, because the other ones haven't been alive 1 week at least.
My article from 12-th position moved to 5-th position
! The phrase is "aquarium filter".
Another article stays at the 2-nd position, but who knows if it's not gonna rank better soon. The phrase is "discus fish".
I think that I'll be wiser after 1 week because I updated totally about 15 URLs in order to expand this experiment.
The facts:
I removed the "?cur_lang=
NUMBER&what=article&id=
NUMBER" and replaced it with simple "?h=
ARTICLETITLE". So the URL after "
?" does contain keywords without hyphens (this is OK, G understands it) and what's more, the URL is shorter now. Also there is a 301 redirect from old URLs to new URLs (I mentioned it before as well).
I am waiting for more results to come soon
. Will keep all of you informed.