Neat Image
Unsharp Mask
reduce noise
What is wrong with a nice plastic board? Also plastic board is a regulation for USCF chess tournament.
Single light source is what kind of lights!
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I'm guessing the "single" source is candlelight, but I'd bet that there are two candles will turn many DPCers off. But regardless of that, the pieces are a bit blurry for my tastes.
single light... i see two.... In terms of the photo itself you might want to think about adjusting the white balance (currently photo is yellow-tungsten cast), and increasing the shutter speed or using a tripod (there is motion blur esp on the left side and a general lack of sharpness all over). Hope that helps.
I'm afraid this doesn't meet the challenge - it should be a SINGLE light source - I can see two. In addition there appears to be camera shake. You need a tripod for this kind of low light shot.