To add a few more ideas to the discussion, here are some expanded and revised versions of the IPC-adjustment concepts and charts that I posted previously. They’re not intended to be finished products; they’re simply meant to generate feedback and discussion. I’ll post the information about them in multiple messages, since I’d probably go over the post-length limit if I tried to put everything into a single message. The sections and parts will be:
SECTION A: The Soviet Union and China
PART 1: Introduction
PART 2: Adjustments for the Soviet Union
PART 3: Adjustments for China
SECTION B: The Pacific
PART 1: Introduction
PART 2: Adjustments for the Pacific
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SECTION A: The Soviet Union and China
PART 1: Introduction
As previously mentioned, the idea is to use IPC adjustments to discourage Japan from heading westward towards Moscow (which it did not do historically, and which would be improbable in view of the distances involved) and to encourage Japan to head eastward into the Pacific (which it did do historically).
On the Global 1940 game map, Japan can in principle launch an attack against Moscow by four different overland routes:
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Through the Soviet Union alone. Starting from Manchuria, Japan can strike north and then west. Under this option, Japan has to traverse at least eight Soviet territories to reach Moscow. Various routes of this length are available, one example being the one that traverses Amur, Buryatia, Yakut, Yenisey, Timguska, Novosibirsk, Samara and Russia.
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Via China. Starting from Jehol, Shantung, Kiangsu, Kiangsi and/or Kwangsi, Japan can strike west across the Chinese territories that are still controlled by China. Japan’s shortest route to Moscow via China starts from Kwangsi and traverses six territories: three Chinese ones (Yunnan, Szechwan and Sikang) and three Soviet ones (Kazakhstan, Samara and Russia).
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Via Mongolia. This route is more trouble than it’s worth. It doesn’t save Japan any time (since it too involves traversing at least eight territories), it violates Mongolia’s neutrality (with all the consequences that this involves), and it gains Japan no IPCs (because Mongolia’s territories have no IPC value).
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Via Southeast Asia. This is an even less attractive option than going through Mongolia: it’s the longest overland route of all, it involves fighting the UK, and it also involves violating Afghan and/or Persian neutrality.
(Just for fun, it should be noted that Japan technically has a fifth option for invading the Soviet Union: by amphibious landing. The Soviet Union has coastlines on four bodies of water that are, in principle, all reachable by a Japanese naval task force: the Pacific (SZ 3, 4 and 5), the Black Sea (SZ 100, if Turkey is under Axis control), the Baltic (SZ 115); and the White Sea (SZ 127). A Japanese amphibious landing in SZ 3, 4 or 5 wouldn’t actually be hard to do, but there would be little point to it because a Japanese overland invasion of the Soviet Union from Manchuria would be more efficient. As for the notion of a Japanese amphibious landing in southern, central or northern European waters…well, it would at least have the virtue of being something that the Allies would probably never expect.)
If we therefore assume that Japan’s only two serious options for invading the Soviet Union are by land through eastern Russia or China, then those are the only two areas where IPC values need to be adjusted in some way to discourage Japan from doing so.
The original concept from a few days ago was to keep the adjustments IPC-neutral for the map as a whole. This hasn’t turned out to be feasible, so the fall-back solution is now to have a net gain of IPCs for the map as a whole, but to keep this creation of new IPCs to a minimum.
The original concept also overlooked the fact that some of the IPC adjustments which had been proposed would have resulted in a net loss of starting income for the Soviet Union and China, which in turn would have negatively affected their ability to buy units. In the revised version below, the IPC adjustments cause no net change to the starting income for the Soviet Union and China. Two different methods, however, have been used to adjust the IPC values of the Soviet Union and China, as will be explained in their respective parts.