If Germany did not take France on turn 1 and bypass Poland there is no way they would win. France and UK would be able to build up and eventually the Germans would have to attack the allies. Believe me…if you dont take France on the first turn Germany is doomed.
I think if Denmark is neutral then the straights should be open to any country. Germany should take Denmark to keep the UK fleet from entering….I will add this in my 6.1 rules coming out this weekend.