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In 203 BC, Han Xin, a general of the Han dynasty, conquered the State of Qi and was enfeoffed as the King of Qi by Liu Bang.
Han Xin's advisor, Kuai Tong, after analyzing the world situation, believed Han Xin was a pivotal figure. He advised Han Xin not to follow Liu Bang but to establish himself as king, thus dividing the empire with Chu and Han. He argued that following Liu Bang would at most lead to being granted a mere lord title. Success or failure depended on this decision, and acting now would be absolutely foolproof. However, Han Xin did not heed Kuai Tong's advice.

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Open the tool →万不失一 (wàn bù shī yī) is a Chinese idiom (chengyu) meaning “infallible”.
万不失一 is pronounced wàn bù shī yī in Mandarin Chinese.
Literally, 万不失一 means “ten thousand, not one mistake”. It is used to mean “infallible”.
万不失一 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
形容绝对不会出差错。同“万无一失”。