In history, a lot depends on accidents. What would have happened if Mstislav Udatny had not interrupted the Mongol-Tatar embassy? Maybe the Mongol-Tatar horde would not have moved west, but went to conquer Japan or India? What would happen if Bogdan Khmelnitsky remained a centurion of the registered army in the service of the Polish king or after the battle of Pilyavtsy 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 true, and this, of course, must be agreed with if there is no way to change the course of history. And if there is such an opportunity?