Red becomes overlapped with Blue within two of Red's hull lengths. Now rule 11 begins to apply and
Blue (windward) shall keep clear. Also rule 17 applies, and therefore
Red is not allowed tosail above her proper course. Red continues to sail the
course she has been sailing for some time and thus does not sail above her proper
course. In the end, she needs to change her course to avoid Blue. Therefore
Blue infringes rule 11. See also Definition
Keep clear.