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The system is rather strange though : how is it possible that armies marching against each other (or at least towards one another) don't meet but then don't move neither ??
Province switching will be a bad thing game-wise but is at least explainable (armies didn't meet and moved to destination), but armies freezing is unrationalizable - given that if one army didn't move they will have met and fought !
Simplest solution would be that there are only 2 solutions, one of the army moves first and the other cancels move, and fighting occurs.