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.