上期和下期平码怎么计算

简介：Li Zicheng was very cunning. Judging from his strategic layout of attacking Chenzhou and Shangqiu, he seemed to be learning from what the Jianlu troops did when they attacked Jinzhou. He first cut off the reinforcements around Kaifeng, turning Kaifeng into an isolated city, and then encircled Kaifeng without attacking it. The strategy is to besiege for a long time and then encircle the point to bring reinforcements.