After the Huaihai Campaign, Mao feels paranoid at plots against himself in the Party, and purges everyone who isn't his sycophant: Liu Shaoqi, Zhou Enlai, Deng Xiaoping, etc. Stalin also takes note of the infighting and begins to play a divide-and-rule strategy in the CPC.
Once the Communists have conquered all of Mainland China, Mao's paranoia backfires and there's a failed coup attempt against himself by Liu Shaoqi who was secretly Soviet-backed. Units of the PLA start disobeying Mao's orders, and CPC cadres begin to half-heartedly enforce his edicts.
Meanwhile, Chiang Kai Shek believes the mainland is not totally lost and has not been prevented by Truman from attempting to take back the mainland...