 offers a big
   collection of go problems of various genres  (life and death, tesuji, ...)
   and difficulties (easy, medium, hard).
   These problems are entered by users and can be replayed on line. They can
   also be downloaded in html or sgf formats. However, the sgf files don't keep the
   genre and difficulty information. gopb2sgf.pl is a Perl script enabling to convert the html
   problem files to sgf while keeping the genre and difficulty attributes. This enables
   to dispatch the goproble