In history, much depends on chance. What would have happened if Mstislav Udatny had not interrupted the Mongol-Tatar embassy? Perhaps the Mongol-Tatar horde would not have moved west, but would have gone to conquer Japan or India. What would have happened if Bohdan Khmelnitsky had remained a centurion in the registered army in the service of the Polish king or, after the battle of Pilyavtsy, had moved his regiments to Warsaw? But the greatest wisdom of the world has long been formulated: history does not tolerate the subjunctive mood. This idea is correct, and, of course, one must agree with this if there is no possibility of changing the course of history. What if there is such an opportunity?