Question
A and X are overlapped and beating on port tack towards the committee boat at the starboard end of the finishing line.
X can fetch the committee boat but A, the leeward boat, cannot. A sails up to this boat and hails for room to tack. X does not respond. A hails a second time, luffs and passes head to wind, whereupon X tacks and protests. What should the call be?

Answer
Because X can fetch the committee boat which is a mark, rule 19.1 does not apply and A is not entitled to room to tack. When A passes head to wind, she becomes keep clear boat, and prevents X from sailing her course. A breaks rule 13. Penalize A.
When A passes head to wind it is clear that she will not fulfil her obligation under rule 13 to keep clear of X, and X will be required by rule 14 to act to avoid contact.