Red and Blue will be penalized. Blue can fetch
the finishing mark. Because of rule 20.1(c) Red shall not
hail for room to tack. In doing so she infringes rule 20.1(c). If Red hails
for room rule 20.2(b,c) requires Blue
to respond either by tacking or by immediately replying "you tack"
and then giving room. Blue fails to do this. The finishing vessel also is a
mark and
Red is entitled for mark-room
by rule 18.2(b), but mark-room
in this case does not include the room to tack. Therefore Red will be penalized
for infringing rule 13 and rule 20.1(c) and Blue will
be penalized for infringing rule 20.2(b,c).