剑走蜻蛉

jiàn zǒu qīng líng

the sword moves like a dragon-fly (modern idiom)

fig. unexpected winning move; unconventional gambit

剑

jiàn

double-edged sword

走

zǒu

to walk

蜻

qīng

see 蜻蜓[qing1 ting2]

蛉

líng

sandfly