Pretty sure the Calc on this site and the TripleA Calc let you tweak the OOL. I forget how the TripleA one works but the Calc on this site has two text bars below the fields where you input unit quantities. One is for attacker OOL, the other is for defender OOL.
What's the best buy for Russia?
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The most effective russian players I’ve encountered are the ones that are able to build up a force that is able to threaten a counter on a german stack. If a good german player wants to go for Moscow they are able to get it, however I’ve seen plenty games where the UK/USA are putting enough pressure on the German player for him to stop just in front of Moscow. If the Russian player only has bought inf at this point there is not much of a threat for the German player to keep russia contained and slowly kill it economically. However if there is a stack of paired inf/art the pushback power is a lot bigger and thus Germany can be challenged and Russia may be able to break the German wall.