Rule 20 is primarily a safety rule to help boats sailing closehauled avoid collisions with obstructions. The rule's role in promoting safety has been enhanced because new Rules 20.1 and 20.3 imply that, when a boat beating to windward hails for room to tack, she must be given that room even if safety does not require her to make a substantial course change to avoid the obstruction, or if the obstruction is a mark that she is fetching. If, after the hailed boat responds to the hail by giving room, she thinks that the hailing boat broke Rule 20.3, the hailed boat may protest. If the hailing boat acknowledges that she broke Rule 20.3, she may take a penalty as provided in Rule 44.1. If she does not, and a protest committee finds she broke Rule 20.3, she will be disqualified. It's easy to comply with Rule 20 when a boat hails you for room to tack. On a beat to windward, whenever a boat to leeward or clear ahead of you hails for room to tack, give her that room and, if you think her hail was improper, protest her.