The wind was coming from dead ahead as surmised above. I was in the 45' sailboat under power, and here is the way I see it. I think the 20 footer should have tacked before creating immediate danger
by crossing my path in the first place, since I was constrained by the right side of the channel and my 40,000 lb boat does not slow easily. When the 20 footer tacked back the other way, he again created immediate danger
in a crossing situation, and my speed had not changed appreciably. On that basis, I believe he made two foolish moves, and Rule
9 seems to support that conclusion in its discussion about "crossing the fairway & impeding". He could have let me pass on either tack with little or no consequesce.
That said, I am responsible for avoiding immediate danger no matter who has the right of way, and a better move on my part would would have been to continue to slow down in anticipation of his second tack. Per the rules I passed just behind his stern with barely enough room to clear the right side of the channel. The other factor is that slowing to the point of steerage loss is not a good idea in a constrained area. My rule
is to always give way when necessary since I am never in a hurry. Just my thoughts. Excellent discussion on this. Thanks