You mean the Persian corridor:
http://en.wikipedia.org/wiki/Persian_Corridor
I’m currently compiling a list of all potential convoys and land supply routes.
In essence it means that ALL income from overseas territories has to be transported via a convoy or overland route.
So far there are 4 Russian benefit routes;
Scotland - UK Arctic Convoy - Karelia
Iceland - US Arctic Convoy - Karelia (there probably needs to be a convoy from EUS to Iceland)
West USA - US North Pacific Convoy - SFE
India - Iran - Caucasus
In each case the Allies must control all 3 stages to have the option of transferring income to the USSR. The PC income comes from India, which has a big block of UK income (India is always massively undervalued in official A&A games). Normally the UK transfers India/Burma income to the UK via Convoys to Egypt, then by another to the UK. But it can choose to divert 3 per turn of this to Russia.
Similarly the US has 3 Atlantic convoy routes to the UK, with which it can send income even when not at war. It’s up to the Germans to decide if it’s worth attacking these and triggering a full US intervention.
There is also a Canadian convoy to the UK which needs to be kept open to transfer Canadian income direct, although this could be spent building units in Canada.
I’ve also listed “trade” convoys from South America to Europe, and of course from all overseas colonies to the main production centres.
The main problem is what to do when Japan takes over eastern routes; should there be an interlinked network of shipping routes so income can be transferred by any reasonable route to and from anywhere, with convoy boxes at staged intervals allowing enemy disruption? The Phillipines could become a major bottleneck for Japanese loot from the DEI…
