Hi Eric. Why did you say "Yellow did not become overlapped from astern (she was ahead)."? Blue came from astern to pass to windward, at some point they were overlapped. What am I missing?
You should read RRS 17 "ON THE SAME TACK; PROPER COURSE" with rapt attention to understand that sentence
In that particular case RRS 17 doesn't apply because the leeward boat didn't get there by overtaking.
You can also say, phrasing it differenty, that RRS 17 doesn't apply as it could be only triggered by the overtaking boat passing to leeward.
Same thing. This rule cannot apply.
