No, I didn't know the signature beforehand, but yes the initials were "Yu" and "P" so it wasn't that hard to figure it out from this point, especially knowing the year (and therefore approximate life time of the artist) the city it was painted in, and obviously the nationality of the artist.
Wow! Thank you - especially Merray - for your help. I'm very impressed! I bought this painting at a flea market (very cheap). It was rolled and needs some professional restauration. Once again: Thank you!!!