Do you miss something on BrainKing.com and would you like to see it here? Post your request into this board! If there is a more specific board for the request, (i.e. game rule changes etc) then it should be posted and discussed on that specific board.
A couple of other simple games vatiations that shouldn't be too hard to bring to this site - possible Dark Gothic Chess, Dark Janus Chess, Dark .... other Chess?
I like Dark Chess since I feel I have more of an advantage (since I stink at regular Chess), and to bring the Darkness to a couple of the other types of chess would be very interesting... plus I would not think too hard to program. :-)
There are hundreds of chess variants in the world, including many which are mundane (even frivilous) but also including some which are great game concepts!
However, the notion of 'combining' two separate concepts together (such as "dark janus chess") has as shown from time to time by enthusiasts not been quite as practical as the theories suggest.
Also, offerings and other things can quickly get complicated and the real meaning of basic ideas lost from a perpetual spiral of combinations.