My reading of the rules is that a boat can be “finished” per the definition, but still be “racing”. The later is important because it has an impact on her rights and the rights of other boats. What do I mean?
I’ll start with Larry’s example 3 above. The port tack boat has gone head-to-wind on the line, and her transom remains on the course-side. The question is “has she finished”. I believe the answer is yes. A part of the boat or equipment (the bow) touched the line while the boat was sailing from course-side to finish side. It doesn’t matter that the transom is not over the line - she’s finished anyway. BUT - she hasn’t cleared the line or the marks, therefore although she has finished, she is still racing, and must still honor the rules, claim her rights and grant rights to others under those rules. (Larry - in order to focus on the issue you’ve raised, I’ll ignore the other twist, i.e. that the boat had not completed her tack onto starboard before the presumed contact with the other boat).
Seems like an odd concept - that a boat can be finished and still racing. Nonetheless, I believe the definitions deliberately allow this concept so that it is clear a boat in the process of crossing and clearing the line is still covered by the rules. Thus, a boat on starboard tack, finished but still racing, has rights over a boat on port tack, not finished and racing.
The distinction is also important because of rule 22.1 - “If reasonably possible, a boat not racing shall not interfere with a boat racing”. As soon as the finished boat has cleared the line and the marks, she is no longer racing. She must then avoid interfering with a boat still racing - or face a protest.
Therefore, until such time as a finished boat has cleared the line and marks, I believe that a starboard boat still racing has rights over a port boat. (Of course in big boats, a starboard boat has rights over port anyway, under the ColRegs - which apply when a racing boat meets a cruising boat). The key thing being that IMHO, if port boat did not seek to avoid contact, thus forcing starboard boat to take evasive action (with or without success), and starboard boat is disadvantaged as a result, then I consider starboard boat has a valid reason to bring a protest, notwithstanding the fact that port boat has finished. If port boat took no evasive action, then the general rule on avoiding contact can still be applied (as well as port-starboard rights) because the port boat is still racing under the rules. If the boat was considered to be no longer racing - just have a go under rule 22.1.
This also answers points 1 and 2 (at least per my interpretation).
As for point 4, this actually happens quite often in big boats, especially in light winds where a tide is running. A boat gets headed on the line, the breeze dies, and tide carries her back to the course-side.
So long as a part of the boat or equipment (no crew on our models) touched the line on a course from the last mark to the finish, she’s finished - notwithstanding that she finds herself back on course side. If she can clear the line (even on course side after “finishing” and clear the marks, she is no longer racing and must avoid interferance under rule 22.1. However until such time as she has cleared the line and the marks, although she has finished, she is racing, and, if now on starboard tack, still has rights over a port tack boat.
What I have to look up is what the remedies would be if a boat finished but still racing infringes another on the course side of the line. Penalty turns must be taken course-side - which would void the finish. Sorry - I need to go back to the rules to check. If I get some time later, I’ll see if I can find any decisions which have addressed these examples.
This is just my interpretation. Anyone should fee free to challange my reading of the rules and put a different case.
Muzza