99% sure open communication is allowed. The extent to which it’s allowed is up to you, though. With my play-group we cut it off at “talk of general strategy is allowed, anything more specific is not.” We do it this way because of bad experiences where multi-player games would devolve into the “good” Axis Player and the “good” Allies Player forcing their teammates to obey their orders on what to do each turn, effectively turning the game into a 1v1 with a peanut gallery. That’s not much fun for anyone.
G40e 1.0: The Game.
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However, my biggest problem is USA being forced to split it’s IPCs between Europe and the Pacific theaters. What? Since when did the United States do an even split? You’re disabling the American ability to flexibly respond to crises as they arise? I.e., “looks like UK is going down due to Sea Lion and Russia is in deep doo doo. Too bad we can’t spend more in the European theater, even though the Japanese fleet is destroyed… Got to build more Carriers in San Francisco” That’s crazy.
I agree here, I’ve since changed my mind about this.