The tenth book of The Small Row is dedicated to the history of the late 18th century - the era of Pugachev and Suvorov. It would seem that such a recent history, only 200 years ago, cannot contain anything unexpected. However, it is not. It turns out that it is the end of the 18th century that hides, in fact, the MAIN MYSTERY OF RECENT HISTORY. Having realized this, we begin to understand, for example, why today it is believed that historians of the 18th century “were wrong in many ways,” and their descendants, historians of the 19th century, already “knew everything correctly.” And also understand a lot more in modern history. The book does not require special knowledge and is intended for anyone interested in using mathematics to uncover the mysteries of our history.