That’s a very interesting strategy that i have not come up against while playing as the allies. My counter strategy would be my normal one when playing as the US, “Cutting the head off the snake.” As the US player i always focus on Japan and sz 6. If such an incident would occur as you mentioned i would assume Japan would already be spread thin, unless they are already spending those 70ipcs. My strategy would be to lure the Japanese to attack me by threatening them with naval forces in the north Pacific. Capturing Iwo Jima and building a air base their is my all time favorite. But to be honest i would not know how this would really work in your scenario.
For those of you who think the game is broken my buddies and I have developed two house rules that greatly change the way the game is played
1. the idea was taken from this forum and that is if Japan does a J1 attack to automatically give the US its 40ipcs.
What this does is it does not given Japan (what I call a J1 cushion). In a normal J1 attack Japan can do as it wishes without fear of a US navy attack for another one or two turns. By giving the US its 40ipcs right away the US can start construction on another naval task force. while rushing its starting navy out to sea.
2.The second rule is more like a National Advantage but it has changed Japan’s strategy in Mainland Asian in our games, and that rule is Chinese Partisans. The rule goes as such “Any territory with a Chinese symbol, even those under the starting control of Japan are subject to this rule. At the end of Japan’s income phase any Chinese territory that does not have at least one Japanese land or air unit in it is automatically given control to China, and 1 Chinese infantry is placed there.”…What this has done to our games has been pretty remarkable. instead of Blitzing all through china and leaving it empty the Japanese player is now subject to leave at least one unit behind! unless of course they don’t mind handing it over to the partisans, but anyways this offers some what of a cushion to British Mainland forces and helps keep Japan from over taking all of Asian within a matter of turns.