AUS2680 and AUS2 sailing to the leeward mark.
AUS2680 on starboard tack in the zone.
AUS 2 on port tack in the zone, overlapped with AUS2680.
AUS2680 changed course to avoid a collision with AUS2.
AUS2 on port tack did not give AUS2680 mark room.
No contact. No penalty taken.
AUS2 is disqualified for not giving mark room as required by RRS18.2(a)