骑士周游世界问题 ， 一个称为骑士的棋子，能否在64个放个的棋盘上都走一次且只走一次？在国际象棋中骑士的移动路线是L型的（在一个方向上走两格，在垂直方向上走一格）-Cavalier travel around the world is an issue known as the Cavalier pawn can take 64 months left of the chessboard once and only go once? Cavalier in the international chess in the mobile line is L-shaped (in a direction away two cells in the vertical direction on a grid walk)