So much depends on how the Russian player retreats…
I have done Shins style once because the player allowed it…if a more polished player controlled it, I would be more hesitant to split forces…but certainly, if its allowable, I agree it is a great way…it works especially well in Axis and Allies Second Edition itself…
I have now played 3 games in a row where I took Moscow as Germany…One way was split as Shin suggested, one was STRAIGHT up the middle (the guy playing Russia left central territories wide open, didn’t even leave a single unit to slow me down, I blitzed right through), and the other time was through the south. I’ve NEVER gone through the North…I could be wrong but it always felt more opposed, not economically as beneficial, and perhaps a turn longer (I could be wrong though, I don’t have the board in front of me.)