Red breaks rule 16.1 and will be penalized. Since Blue tack in the zone and Red establish a late inside overlap, rule 18.3(b) applies and Blue shall give mark-room. Because Red luffs above her proper course her infringement of rule 16.1 is not exonerated by rule 21(a). Blue unavoidably breaks rule 11, but she is exonerated by rule 64.1(a). See also Case 93.