八皇后是个古老而有趣的游戏，是由高斯于1850年首先提出的。

要求在国际象棋的棋盘上放置八个皇后，使其不能相互攻击，即任意两个皇后不能处于

棋盘的同一行、同一列和同一条对角线上。试问有多少种放法？-Eight Queen s is the oldest and interesting games, by Gauss in 1850 first proposed. Requirements in the international chess board to place eight of the Queen, making it unable to attack each other, that is, any two of the Queen s not in the same line board, the same columns and with a diagonal. How many kinds of caving law?