alternatehistory.com

Contemporary Russia is pretty much the direct-line descendant of the Grand Principality of Moscow, which had as its first major rival (kind of the Etruscans to its Rome) the Grand Principality of Tver. The challenge, should you choose to accept it, is to have instead of Muscovy unifying Russia, have Tver and its more Baltic-Western inclined system defeat Moscow and ultimately unify the old Kievan Rus region.
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