◎ 鹬蚌相争,渔翁得利 yù bàng xiāng zhēng,yúwēng dé lì
[two dogs fight for a bone, and a third runs aways with it;Parties in a quarrel are both losers] 比喻双方争利、互不相让,结果两败俱伤,反而使第三者得利