I should have added that, on the open sea, “pursuing” ships might have to make a search roll to continue the combat. On the other hand, the “retreating” fleet might be trying to draw them away from certain areas.
Another of my HRs effecting naval combat is that, on each and every one of its own nation’s turns, each and every ship must refuel. That is it must demonstrate that at some stage on the turn it is in a SZ bordering a friendly or neutral (not pro-the enemy) land territory.
A fleet crossing the Atlantic, for example, can start by refueling off Washington and end its turn in the mid Atlantic. On the next turn it sails to the coast of Britain (or friendly France) and refuels there. But it cannot spend at entire turn on the open sea without refueling, nor can it end a turn in such a position as would make refueling next turn impossible.
This can make otherwise unimportant land tts or islands much more valuable as “fueling stations”
As far as defender retreats on land are concerned, I have no objection to these either, though unlike naval combat the retreating defenders should have to undergo a round of enemy fire without shooting back. I even allow them to “evacuate” by sea if transports are available.