ИС-2

The IS-2 is an upgraded version of the IS-1. After the IS-1 was quickly introduced due to need of fielding a better heavy tank than the KV-1, a trial was held to find a more effective gun because it didn't make much sense for a heavy tank to be armed the same as a medium tank. A 100mm gun and 122mm gum were tested and though the 100mm had better armor penetration, the 122mm was chosen because there were more of the guns available (since it was already a field gun in service) and it had a much more effective HE shell. It was also tested against a Panther tank at combat ranges and was deemed sufficient so the gun was placed on the IS-1 and entered production as the IS-2. The tank has over 100mm of armor protection all round and was also lighter than the Panther and Tiger tank with a lower profile.

In game
The IS-2 is the Russian tier VII tank. It has the lowest health and fire rate but has the highest firepower coupled with the second highest top speed in its tier. It has a very low profile making it hard to hit plus its sloped armor is very bouncy causing enemy shells to frequently ricochette off. The down side is that it has very bad gun depression meaning that it's very hard to be aimed with making it one of the fewer tanks used by players as a top tier vehicle. It can stand against any tank in the game though like all tier VII tanks is vulnerable to flanking runs by faster lower tier tanks. Against experimentals it's best to flank and use thaty powerful gun on their sides or rear. You have enough speed to dogfight with them though the gun depression makes dogfighting not a good tactic over uneven ground. Just don't expose those long sides to the experimentals guns or you will be gone in three shots.