How many
chess computers
-- does it take to change a light bulb?
Four. One to remove the light bulb by capturing it en
passant, one to put the new one in by taking back the move
whereby the old one was unscrewed, one to go snatching some
pawns while all this action takes place on the other side of
the board, and one to flash its lights, make lots of noise,
and announce out of the blue that it has found a forced mate
in seven....
