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