P and S are fetching the windward mark. P will tack close to the mark in the zone. S is above the lay line a bit. P tacks to starboard as S enters the zone and overtakes P to windward, just as she completes the tack and powers up. If I’m reading the rule right, while P doesn’t have room rights because she tacked in the zone, as long as she doesn’t push S above close-hauled, she’s still the leeward boat and S cannot push P below the mark, correct?
Scenario #1 - No rule broken.
Yellow is not caused to alter course during Red's tack and is not forced above close-hauled course after Red passes HTW. Red initially gave Yellow room to keep clear when Red fell to a close-hauled course and gained ROW, therefore Red did not break RRS 15.
Scenario #2 - Yellow breaks RRS 11.
Cyan completes her tack without Yellow altering course and Cyan initially gives Yellow room to keep clear (no RRS 15 breach). Yellow does not owe Cyan mark-room, but she must keep clear of Cyan under RRS 11. Yellow, forcing Cyan to leeward, did not keeping-clear of Cyan, and broke RRS 11.
Scenario #3 - Purple breaks both RRS 18.3 and RRS 13.
Yellow must alter course while Purple was required to keep clear under RRS 13, therefore Purple breaks 13. The incident occurs before Purple obtains ROW, therefore RRS 15 did not apply at that time. Yellow is also forced to sail above close-hauled after Purple passes HTW from port to starboard inside the zone, thus Purple also breaks RRS 18.3.