I thought that three person chess was one of Sheldon Cooper’s ideas, but it’s not. According to this wikipedia page there have been variants since the 18th century.
The board above was found at hiConsumption and you can buy it in amazon here.
[vimeo http://vimeo.com/9335293 w=568&h=330]
Animated parody of Ingmar Bergman’s classic Seventh Seal created by Nick Hilligoss.
In this version, the knight challenges Death to a drinking game instead of a chess game. Check the original scene here.
Found here. Link to video.