I like the concept here. Perhaps a lower angle and a white balance correction would help. Also, put the board against the wall, that way, the shadow pieces would look like they are on the board and look like the black pieces.
too funny...i was going to do the exact same thing for this challenge but i didn't like the way the shadows were cast so i dumped it...great minds think alike...lol
Okay, great idea but a few things to help this shot out. Bump up your aperture a stop or two to get everything in focus. OR stop it down and focus on the tip of the queen to get the other rooks just out of focus to draw your eye right to your main subject.
Now overall this shot has a really yellow and unattractive tone or "cast" to it. You can easily correct this with curves or the equivalent white balance adjustment with what ever software you are using. Also you can adjust this with most cameras by changing your white balance setting or your auto settings to tungsten or fluorescent. This will help eliminate this yellow cast.