@seancb
I think a sub spam purchase is easy for the UK to mitigate if there isn’t 2 subs off Canada and they have the destroyer in sz 109. After the UK has Canada free, it’s easy for them to drop a destroyer there…German subs than have to scamper off the coast of UK.
You might get 1-2 good rounds of convoying.
However, if doing the sub thing, need to start it off right from the beginning.
G1 Purchase 3 Subs, 1 Bomber.
I learned that from someone I play with regularly online.
What you do you is ignore SZ 110 on G1.
Hit 109, 106, and 111 in order to clear all destroyers. There is a way to send enough Air to both 111 and 109 to ensure UK doesn’t scramble or it (dice permitting), usually a lopsided victory in Axis favor.
If you win all 3 zones with subs over, you might get 9-10 IPC convoyed turn 1. If everything being fair dice, UK may have to turtle purchase UK1, which means you may get another good convoy UK2 (because of the 3 sub purchases G1).