A topic for racing folk.
On Friday, I had the situation of running downwind off the start line on starboard, with another boat to leeward, overlapped and close enough to enjoy some banter. As we approached a line of moored boats (obstruction), I made mention of my need to gybe to avoid the obstruction, he agreed and gybed and so did I. All as per the rules.

After the race, we had a rules quiz. And they did almost the same as my scenario above. Except they changed the windward boat to be on port. Picture below. Does a port tacker enjoy the same rights as a starboard tacker when it comes to a 'continuing' obstruction?

You can't just barge in though:

19.2

(c) While boats are passing a continuing obstruction, if a boat that was clear astern and required to keep clear becomes overlapped between the other boat and the obstruction and, at the moment the overlap begins, there is not room for her to pass between them, she is not entitled to room under rule 19.2(b). While the boats remain overlapped, she shall keep clear and rules 10 and 11 do not apply.

That would just be normal port-starboard rule. The guy on port would need to bear away.

I think you will find that no boat that has right of way can force another boat into peril. Remember col regs also come into play here, a car can not run another car off the road and neither can a boat. If there is an accident the insurance company will look at col regs before racing rules. You must give the boat water. If you think the boat had an opportunity to avoid the obstruction or obstructed you, it is up to you to protest not force an accident. Under the rules all boats are to avoid a collision. I have been racing and CRO for many regattas for many years and I am sure if I sat down with the rule book long enough I would come up with all the rules that relate.