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.

Bergman revisited

[vimeo 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.

Dildo Chess-Set

Dildo chess set

Dildo chess set 4

Dildo chess set 2

Chess set consisting of 32 dildos made of medical-grade silicone and ABS. More, here.