What can I say, it's a simple drag and drop game? So technically this isn't really much of a game on it's own, you need 6 players, honestly at any give time I don't happen to have 6 friends in the room, if I did then I wouldn't be using my computer and being all antisocial. And technically couldn't I just get an A3 piece of paper, draw the grid on it and use pieces from the chess sets I own? Not that I'm much of a chess fan myself and not that many of my friends are either.
I'd be more impressed if it wasn't just a drag and drop game, in that there's actually no other programming involved. Usually a chess game (even the two player versions) is at least programmed so you can only move on your turn and you can only move one piece on your turn and that you can only move the pieces which you are supposed to be able to move. With this there was no restriciton, you could move any piece, anywhere, at any time and the game comes with a whole wall of text as instructions. Yet strangely it has no instructions on how to play chess, it simply assumes we already know how.
The conversion of chess to 6 player chess isn't as smooth as the many 3 player and 4 player chess, since you had to add extra squares which don't exist on a normal board. And generally the idea of multiplayer chess is that all players start an equal distance away from each other for fairness, it was more like two boards in one here, it may have been wise just to make it 4 player. The art also wasn't particularly good, you didn't use the generally excepted design for certain pieces.
And here's the final problem with this game, you missed out 2 pieces from each player. One of those two pieces being the most important piece in the game, the Queen.