- do not allow to move enemies piceses?

+ Schlagen im Vorbeigehen (engl. En passant)

- translate db_update.php?

- an option to allow others to make comments in one's game?

- need akinda SCORE table to see how many time won against others. do not href
  to profile.php but to member.php with a score board. make member.php?lookup
  from member.php possible.

- GUEST sees board always from the black side. Problem?