Trap chess is a variant upon the ancient game. Randomly selected squares open down, eliminating any pieces unfortunate enough to be on top.
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Hackaday explains that neighbors Bob and Yann invented this practical model. At the end of a turn, each player taps on the button which will trigger a trapdoor:
The build relies on a PIC16F818, an 8-bit microcontroller from Microchip. This helps interface between the timer and servos and generally runs the whole show. The board is built into a table, and we’re impressed by the fit and finish of the final product. From a distance, it’s difficult to notice anything is awry, and it would make a great prank when playing with an unsuspecting mark. Just make sure there’s no money on the table first.
Source: neatorama