I think a retreat south is just as good as dieing in place. For the sake of my post, since Moscow fell, I’m going to assume that the US went at least 90/10 spending or more for a KJF strategy and Japan has been economically knocked out of the game. The Pacific Allies plus whatever US stuff there (no more US builds) can continue to push Japan back and the game is around round 9-11 (typical timeframe of a Moscow fall).
Going south, the Russian stack can continue to be reinforced by the UK along the entire way with more UK fighters and mech infantry once it’s closer while the Red Army has the chance to stay one position away from the German infantry/artillery. Another potential plus is that the Stalingrad minor IC could be kept out of German hands which prevents units being purchased and a 2nd order effect of slowing Germany’s builds for it’s drive to Cairo. Obviously if Germany stacked in Rostov then the Russian stack might not be able to retreat south (can people not point out obvious stuff please). If the Red Army can make it to NW Persia then it’s home free to Cairo which I believe will result in an allied victory in the long run.
If dieing in place instead of evacuating, than I believe that the UK should sacrifice it’s huge stack of fighters it placed in Moscow otherwise not enough German tanks or air will be taken as a casualty to make it worth it.
I don’t think the US should be focused on Normandy or Norway, ect. in the event Moscow has fallen whether dying in place or evacuating. If for instance the allies do choose to invest a ton of money into getting Norway to hold it, than they better get Leningrad real soon and keep building because the allies must liberate a VC. However, I think those adventures are mostly just irritating for Germany, and don’t protect the remaining easiest VC that Germany needs to win which is Cairo. Germany will have more than enough money to spend on 2 factories in the east to keep driving towards Cairo while simultaneously purchasing ground in Leningrad and it’s major ICs. I think the US and the UK should be focused on defending Cairo which at times could mean the US purchasing 8 fighter 2x in a row. AFTER Cairo is very secured, then the focus could shift to landings at European weak spot areas.
Who cares about China if the lone remaining VC (Cairo) is secured; if secured, no way the Axis can win the game. If China is overrun than this game is an axis victory anyways which makes this discussion threat a mute point. The Allies have to do good at least on one side of the board.
This is my opinion based upon playing a far superior player who demonstrated this against me in a game.