天下三分之計

Meaning

From Zhuge Liang’s grand strategy of splitting the realm into three, it means a sweeping master plan built on reading the whole board — securing your own base rather than fighting the strongest head-on.

Origin story

Meeting Liu Bei on the third visit, Zhuge Liang sketched the shape of the realm without leaving his cottage. Cao Cao, with a million troops and the Emperor in hand, could not be fought head-on; Sun Quan, whose family had held the Southland for three generations, should be an ally. The heart of the plan: Liu Bei should take Jing and Yi provinces and become the third pillar. Divide the realm in three, then, when the moment came, march north on two fronts to restore the Han. This conversation — handing a landless wanderer a map to the empire — is the Longzhong Plan.

Source: Records of the Three Kingdoms — Zhuge Liang (the Longzhong Plan)

Modern examples

• Rather than charge the two giants head-on, the latecomer carved out its own third of the market — a classic divide-in-three play.
• With the league split between two powers, the new team quietly built strength to make it a three-way race.