There are a few chess playing sites which accept bitcoins and allow PvP matches. They have already been mentioned before, just read the thread from the beginning and you will not ask questions that have already been asked and most likely answered here. It is not very long and makes an interesting read by itself.
Though I still doubt anyone will be able to earn anything there.
Do you have the name of a few because i checked google and didn't find much.
You checked with Google but didn't try to check with this very thread, though I specifically mentioned it? The sites have been revealed in this
post (with all due credit), don't be lazy to jump there. I'm not quite sure about the first site, I mean whether it accepts bitcoins (didn't investigate into this issue), but the second one seems to be accepting as well as paying prizes in bitcoins.