Its simple really, the ability to build minor and major IC is what, in my opinion, unbalances the game. The Japanese ability to build minor ICs in a captured Alaska or on the Chinese mainland changes the dynamic too much. Normally, Japan’s major issue is the need to balance its IC and its needs with the reality of having to build in Japan and transfer any land units to desirable locations. Its a good challenge for the Japanese player - and it makes transports super important. Moreover, its a fun dilemma.
However, once Japan builds one of those minor ICs the dynamics change too drastically. Instead of having a key vulnerability, the ability to create minor ICs allows Japan to circumvent the pressing needs of transports and simply produce whatever land units it needs and whatever point it needs. The challenge of balancing long term strategy and the transport requirements to fulfill that strategy are not eliminated outright, but severely reduced. For me, this makes the Japan position a lot less fun.
Does Japan need minor ICs to win the game? No, not in my opinion. Thus, I’m thinking for all future games of AAP40 my friends and I play we are considering using one or both of these house rules:
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Only Japan and ANZAC may build new IC - and then they can only do so in their home provinces (Australia or Japan).
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Building a new IC takes two turns to come into play from the round in which it is paid for.
Thoughts?