When rule 22 or 23 applies between two boats, Section A rules do not.

22 STARTING ERRORS; TAKING PENALTIES; MOVING ASTERN

22.1 A boat sailing towards the pre-start side of the starting line or one of its extensions after her starting signal to start or to comply with rule 30.1 shall keep clear of a boat not doing so until she is completely on the pre-start side.

22.2 A boat taking a penalty turn shall keep clear of one that is not.

22.3 A boat moving astern or sideways to windward through the water by backing a sail shall keep clear of one that is not.