These chess variants are based on the original Star Trek tv series of the 1960's. In episode 71, a planet was populated by two different people(s). They were either black on one side / white on the other OR vica-versa.
 
(too much) info: Season three, #71 - 'Let That Be Your Last Battlefield', planet - Cheron, opponents - Bele & Lokai, stardate 5730.2, first aired Jan 10, 1969.
 
Object: Normal Chess but with contrasting Graphics. All pieces on the lefthand-side are shown as black, all pieces on the righthand-side are shown as white. Regardless of their currently displayed colour status, the chesspieces never change owners.