In coorporation with Jacob Lildballe (another Ph.D student at IAU) I have enabled a robot (see the picture above) to play a game of checkers, using a camera to see the board and the pieces. The checkers player is capable of calibrating itself at start up (that is determining the relationsship between the robot and the camera placement), and later to detect whether the camera or robot base has moved and recalibrate. Without human guidance it can locate the checkers board and pieces and determine if anything has moved. The checkers player works even though the light is shifting (in time or space) and is very tolerant regarding noise in the picture. The checkers player can therefore without further instruction interact with anyone who knows the rules of checkers. This has been tested at an exibition in Copenhagen in february 1996 where the robot played against the public. During the five days of the exibition the checkers player did not fail once in finding the board and pieces or performing the move.