鷸ㄩˋ蚌ㄅㄤˋ相ㄒㄧㄤ爭ㄓㄥyùbàngxiāngzhēng，漁ㄩˊ翁ㄨㄥ得ㄉㄜˊ利ㄌㄧˋyúwēngdélì

简鹬蚌相争，渔翁得利

英lit. sandpiper and clam war together and the fisherman catches both (idiom); fig. neighbors who can't agree lose out to a third party