In this scenario boats are entered the left gate zone on starbord tack, overlapped, Blue has mark room under 18.2, Yellow is ROW under R 11, and Blue is staying clear, and Yellow is required to give mark-room.

Blue claims mark room and Yellow gyps at 1 to 1,5 boats lengt from the left gate and round the right gate.

After that, if Yellow is clear ahead of Blue at the zone of the right mark,

Is Yellow is braking RRS 18.2 at the left mark ? and  required to give more mark-room.