1.) What organizer/parent in their right mind thought that this was a good idea. Never place humans within the reach of industrial robots. He's lucky to have only broken a finger.
2.) Why make a robot pick up the pieces? Handling movement of chess pieces by a computer has been done safely since the early 1980's by Milton Bradley.
3.) Was the boy actually playing against a computer player? If so, why? Computers are already much better than humans and have nothing left to prove in the chess arena. If he's playing a human why is a human not moving the pieces?