1815 on a close hauled beat to windward on stqrboard tack seven boat lengths from the windward mark.
1808 on a close hauled beat to windward on port tack and on a collision course with 1815.
1815 luffed and at the same time 1808 luffed and tacked.
No contact. No penalty taken.
1808 did not keep clear of 1815 as required by RRS10