I give an example of such exploit: surface fleets should not be surrounded by subs on the high seas because then the surface fleets cannot be touched.
Or should the players agree at the beginning and if not then everything is permitted?
EDIT: here I list the supposed exploits mentioned below so it can be used as a reference when starting a game.
- Subs surround your own surface fleet for protection
- Diplomacy
- Finns should not enter Winter War gains of USSR until at war with Axis
- Limited number of paratroops