《新五代史·列传·周臣传第十九》
失败的人对着棋子专心注目，成天劳心伤神，如果让善于下棋的人看了，只要替他改变棋子的位置就胜了。
败者临棋注目，终日而劳心，使善奕者视焉，为之易置其处则胜矣。
The losing player concentrates on the chess pieces, worries himself all day long. If a good chess player sees it, he only needs to change the chess piece's position for him and he can win.