I started my first "real" game of chess on AWS Mechanical Turk last night, using a Raspberry Pi as a server, and here is the progress after 10 moves:
I'm paying $0.15 per move, and getting just below 1 move per hour. At some point I will have to investigate the relationship between payout and move speed. Two workers have submitted two moves each, the other moves have been from different workers.
Also the robot arm to move the chess pieces is coming along as well:
My one problem is that I purchased a Hitec HS-805BB from someone else than Lynxmotion, and it appears to come with a different servo horn than the AL5D arm was expecting, so I have to figure out how to obtain the arm-compatible servo horn.