ms collection in sgf collections:</p>
<ul>
<li>by genre
<li>by difficulty
<li>by genre and difficulty
</ul>
<p>The gopb2sgf.pl script enables also to gather the problems where a given string appears and to detect
   some syntax errors (unbalanced parentheses, unbalanced brackets, invalid property names). It can even
   delete some annoying and useless CR marks.
</p>
<p>Download the <a href="gopb2sgf.zip">gopb2sgf.pl</a> script
</p>
<hr>
<a name="Pb4x4"></a>
<h3>4x4 problems from goproblems.com