Napoleon invaded Russia on 24 June, 1812
He lost there and after 21 months Russian armies (with Allies) seized Paris.
Your challenge, if you choose to accept it, is to have the Soviet Armies after the start of Barbarossa seizing Berlin in the same number of days/weeks/months.
That would mean Soviets in Berlin by March 29, 1943.
Let's make this happen.
As long as Barbarossa *does* start and starts on its historic schedule of June 22, 1941, you can select a pre-invasion PoD. However, double your points for a post-invasion PoD.