问题描述：在8×8的国际象棋棋盘上，如果在放置若干个马以后，使得整个棋盘的任意空位置上所放置的棋子均能被这些马吃掉，则称这组放置为棋盘的一个满覆盖。若去掉满覆盖中的任意一个棋子都会使这组放置不再是满覆盖，则称这一满覆盖为极小满覆盖。设计程序完成如下功能。-Problem Descr iption: On 88 chess board, if placed after several horses, making the whole chessboard placed on any empty position of these pieces can be eaten by horses, called this group a place to board full coverage. If full coverage removed in any one piece will be placed so that it is no longer a full set of covers, called the full coverage for a small full coverage. Design process performs the following functions.