说明：  国际象棋中的象在棋盘上总是沿着对角线方向移动。若两个象互相处在对方可以到达的位置上，就可以互相攻击。如下图所示，黑色的格子表示象B1能够到达的位置。象B1和B2间可以互相攻击，但B1和B3间不可以。B2和B3间同样不可以互相攻击。
(As in chess on the board is always moving along the diagonal direction. If two like each other in the position of the other party can reach, you can attack each other. As shown below, the black grid like B1 can be reached. Like B1 and B2 can attack each other, but between B1 and B3 can not. B2 and B3 between the same can not attack each other.)