IS-3, a tank designed and built during the Great Patriotic War but never having time to take part in it, although it took part on September 7, 1945 at a joint parade in honor of the victory in World War II, making a huge impression with its power on the allies. This tank was in service with the Russian army for 48 years until 1993. What would have happened if he had entered the army not in mid-1945, as was the case in real history, but already at the beginning - mid-1942. Soviet IS-3 against the German menagerie of Tigers and Panthers, who would terrify the enemy on the battlefield, and who would have it left?