I will be using the Speed & Smarts Facebook page to answer your questions about the new 2013-2016 racing rules. Click here to read the Q&As that have recently been posted (or to post a question yourself).
Notes on new 2013-2016 Learn The Racing Rules DVD set:
Rule 18.2c – The narration says: "A can ‘close the door’ on B, but not by sailing higher than her proper course." That is only partially true. We didn't have time to go into great detail about this on the video but here are a few more comments: A is a leeward boat with the right of way, and she does not have to give B room between her (A) and the mark. So if B tries to squeeze in there, A can 'close the door' and B must keep clear. A can go head to wind to do this because she still has the right of way as a leeward boat. However, if A sails higher than her proper course to 'close the door' she must be careful to comply with all other rules. For example, whenever A changes her course she must give B room to keep clear (rule 16 Changing Course). If A breaks rule 16 while she is sailing above her proper course, she will not be exonerated for breaking rule 16. However, if A does not sail above her proper course then she is operating within the room or mark-room to which she is entitled. In that case she will be exonerated for breaking any of the rules listed in rule 21 (Exoneration). As long as A doesn't go above her proper course she can luff as quickly as she wants and she will be exonerated if she breaks rule 16 (but she must still comply with rule 14 Avoiding Contact).
Rule 20.2 – When discussing hails for room to tack, the narration quotes ISAF Case 54 as follows: “The protest committee should accept a leeward boat’s judgment that safety required her to change course unless there is little or no doubt that the boat’s hail was earlier than necessary.” Case 54 has temporarily been removed from the Casebook while the ISAF Rules Committee discusses and rewrites it in accordance with the 2013-2016 rules. It is very likely that the new version of Case 54 will include the language above. If there is any change I will post it here.