"Help Thy Opponent" should auto imply instruction required, Strange and Fun (Whatever the diff between the two is... Maybe they should be united?) as should "Black or White" and "Choose your difficulty"... Would make pages tidier... And maybe some scroll-down menu for the implied groups? ^^* i think just making such groups "sub groups" and including these problems in the list of their parent groups (maybe even with another column?
) should be enough - "browsing weird problems from a sane 'playing with opponents stone" problem is..." 
{Posted by santa c}