PC: Reds win the Finnish civil war?

I don't know a great deal about the Finnish Civil War. Is there a plausible way for the Reds to win?
This is rather hard goal to achieve. Germany needs to be completely unable or unwilling to help the Whites, while Reds would somehow have to gain more aid from Russia and in addition find a Trotsky-like military leader to turn the rag-tag red guard militias into an actual fighting force, while Whites will have to lose Mannerheim and other more experienced military leaders they had at their disposal in OTL.
 
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