It would seem that the explanation of the straits still leaves something to be desired... so I will attempt to make up some examples and explain it from there.

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Example 1:
Europe F Atlantic Ocean
North America F Bermuda Triangle
Mexico F Gulf of Mexico
West Africa F Trinidad & Tobago
South America F Panama

Situation 1-1:
BRM - CAR
MEX - Cub
ATL - Hai

The NAm fleet would need permission from ONE of Mexico or Europe to pass through the strait.
NOTE: If Europe wished to grant permission, he would simply add "Permit BRM - CAR" to his orders.

Situation 1-2:
BRM - CAR
MEX - Cub
ATL - Hai (*bounce*)
TRI - Hai (*bounce*)

Because of the bounce, the Haitian side of the strait is not controlled and BRM - CAR does not need permission.

Situation 1-3:
Pan - CAR
BRM S Pan - CAR
MEX - Cub
ATL - Hai
TRI - CAR

The support from BRM requires permission from ONE of Europe or Mexico or else it will fail and Pan will bounce with TRI.

Example 2:
West Africa F Aegean Sea
Europe A Zagreb
Persia A Ankara
Russia A Nizhniy-Novgorod

Situation 2-1:
AEG - BLA
Zag - Gre
Ank S Zag - Gre

Land units control straits as well. Since both sides of the strait are controlled at the END of movement, WAf would require permission from ONE of Europe or Persia

Situation 2-2:
AEG - BLA
Zag - Gre
Ank - Cau (*bounce*)
Niz - Cau (*bounce*)

Because of the bounce in Caucasus, Persia's unit is back in Ankara by the end of movement which means WAf still requires permission.

Situation 2-3:
AEG - BLA
Zag - Gre
Ank - Gal

By the end of movement, Persia no longer controls Ankara's side of the strait, thus permission is no longer necessary because at least one side of the strait is free.

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These are all the possibilities I can dream of at the moment. I hope I can get away without making visual representations of these situations because that would take me a while...

Further questions?

mvp