One day, a man was walking along a street when he happened to look over a fence into a garden. There sitting at opposite sides of a garden table were a man and a large dog, and on the table between them was a chess set. From time to time, the man moved a piece or the dog moved a piece, picking the pieces up delicately with its mouth and placing them back down precisely. As the passer-by watched, the man put the dog into checkmate and sat back, arms folded. The dog studied the board for a while then jumped down from the chair and trotted off into the house, tail down.
"Wow!" called the passer-by, astonished. "Your dog is incredibly intelligent!"
"Not really, replied the man, "he hardly ever wins."