how about viewtopic.php?f=18&t=1073

(or http://www.pcb-dev.com/index.php?option ... ng=english for a direct link)

Just put all electronics below the board (even the camera) and you have a clear view.
(you can even add special boardmarkings at the back side for positioning, just paint it white at the top)

ADDED later

was thinking maybe also mark the stones with circles of the opposite colour at the bottom makes them easely recognisable / countable. (instead of a black cloud it becomes 3 clear white circles)

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Promotor and Librarian of Sensei's Library