Y reaches the zone of a starboard-hand windward mark clear ahead of B and slightly above the layline. Both boats are on port tack. The next leg is a beam reach. Y stops with her bow 1½ lengths to windward of, and level with, the mark. B, on the port tack layline, tries to sail between Y and the mark. However, Y bears away below her proper course and there is no longer space for B to pass between Y and the mark.. B makes contact with Y and the mark and protests. What should the call be?
When Y enters the zone she is clear ahead of B and is entitled to mark-room under rule 18.2
(b). Mark-room includes room for Y to round the mark as necessary to sail her course and, when B becomes overlapped inside her, rule 18.2
(c)(2) requires that B also gives Y room to sail her proper course. B does so and complies with rules 18.2(b) and (c).
After B becomes overlapped to leeward of Y, Y is required to keep clear. She fails to do so and breaks rule 11
. She is not entitled to exoneration under rule 21
(a) because she is not sailing her proper course or within the mark-room to which she is entitled.
B breaks rule 31
but was compelled to touch the mark as a consequence of Y’s breach of rule 11
. Exonerate B under rule 64.1