Today's Q&A was send in by Luigi:
We are in a Match Race. Yellow is ahead with an outstanding penalty at the windward mark on port, Blue is very close to Yellow on starboard.
At the windward mark Blue infringed a rule but went out of the zone, leaving the mark, ahead. The umpire signaled a Blue penalty with a Red flag. In the mean time Yellow sailed to the left side of the course (looking downwind) more or less abeam of the Ump rib. The Umps are looking at the Blue boat taking a penalty and they decide that Blue is still ahead after having taken her penalty. They give another Blue penalty with a Red flag.
During this time Yellow decided to clear her penalty and she did her turn but without any acknowledgment (whistle or flag) from the Umpires (the didn't see her take the penalty).
The Umpires give another (third) penalty, again Blue+Red to the Blue boat, because she's still ahead after having taken her second turn. After that Yellow is ahead of Blue and both run to the finishing line. Blue in a position one length astern of Yellow.
The Umps realize Yellow cleared her penalty at 4 to 5 boat lengths to the finishing line and they lower the Yellow flag (which was still on the pole) without any sound. Blue see Yellow cross the finishing line without clearing her penalty and, looking at the umpire rib, see there is no Yellow flag on the pole anymore.
Blue request redress by raising her Red Flag.
During the hearing Blue said she was waiting for the penalty of Yellow without interfering because Blue didn't need to do anything else for winning.
The delayed time for lowering the Yellow penalty flag on the umpire boat and the absence of any sound signal were instrumental in this tactic. If Blue had known there was no longer an outstanding penalty for Yellow, she wouldn't have waited until the finish to do something.
Blue is asking for a re-sail of the match. What is your decision?
On a personal note: I'm back home; safe and sound, but have a tale to tell about the conclusion of my Italian adventure, which I hope to post in a couple of days...