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alternatehistory.com
One of my favorite battle grand strategy games is Ageod's Russian Civil War game.
One of the scenarios that it allows you to play is an alternate history set up of a victorious Central Powers (forcing an armistice after a successful 1918 offensive in the West that takes Paris and overruns the Channel Ports) keeping their post WW1 Brest-Litovsk gains but the Reds still winning the Russian Civil War and decisively because of no intervention. The scenario revolves around the idea of the Central Powers and some post WW1 independent states like the Baltics, Finland, Ukraine (but not Poland, because that is not a thing!) with the brunt of the onus on Imperial Germany facing down the Russians and trying to invade. The point is for the Russians to survive and potentially force a revolution in Germany by overrunning Poland, or for the Germans to win and completely take everything west of the Urals. It starts in January 1921 and ends in December 1924.
Who do you see winning this fight and why? Do you see the scenario as plausible?