Obviously the current unrestricted submarine warfare rules are a lot to be desired. And this doesn’t change much or solve whatever problems it has.
Instead, this is merely a way to quickly and simply make the game slightly more historically accurate.
Extend unrestricted submarine warfare to sea zones 16, 17, and 18, and have it apply to Austro-Hungarian and Ottoman submarines.
The second house rule is that for every Allied surface ship in sea zones 5, 9, or 10, one of the following things happen (I haven’t decided on the rules, choose the one you think works best):
Germany loses 2 IPCs per ship on their turn during the Collect Income phase.
A dice is rolled, and on a roll of 3 or less 2 IPCs are deducted from Germany during the Collect Income phase.
So, what do you think?