I was about to make a topic about this statement in the FAQ until I went back and read the rulebook:
Q. If a (power) with which I’m not at war moves an unescorted transport through a sea zone where I have a submarine, can I attack it?
A. No. However, if that power is making a combat movement that will result in war with you, you are already considered to be at war and may attack it.
From my understanding, this is a change from AA50, where the attacker could always ignore subs and the defending subs have no choice (thus preventing sub stalling). But now, unescorted transports can be hit on a one-to-one basis by defending subs on a roll of 2 (which is their attack value while they would normally be defending …whew). I guess I should be faulted for not reading the entire rulebook (I only read the parts that seemed new and were highlighted on here).
Are there any other significant changes from AA50 (that are not obvious, like war declaration) that should be highlighted here? I know about carriers now taking 2 hits, and battleships and carriers require repair now (which is at the end of the turn, right?)