According to rule 13, Blue
must keep clear of Red until she has borne away to a close-hauled course. This
does not happen until the final frame. But even after that, Blue must initially
give Red room to keep clear as indicated by rule
15. Blue does not do this, for Red is forced to react before the completion
of Blue's tack in order not to risk a collision. Blue has needlessly tacked
too close to Red and infringed rule
13 and/or rule 15.