Here is the list of the rules I came up with for the discussion:
1) The subject of discussion is the passage of Deuteronomy 18:15-18, and as such, the entire chapter must also be part of the immediate context.
2) All argument must relate to the context of the subject in a direct form, or to serve as an explanation of a particular term used in the subject. For example, to explain the term of “brethren”, we may make reference to other passages, which clarify the use of this term in the context of the subject. However, other prophecies about something else, that do not have any direct relationship to the subject, should not be included. For example, arguing about how there are other prophecies in the NT that speak of “the paraclete”, for these do not explain any term used in Deuteronomy, nor do they relate directly to the context of Deuteronomy.
3) All responses must be directly related to the previous responses. This mean that, if one person poses an explanation of how something must be interpreted, the respondent must either respond with approval of that explanation, or offer an explanation that will reject that one – or offer an alternate explanation that might also be applicable. But it is not proper to simply ignore an explanation, and give your own without showing why or if you disagree with the explanation of the other respondent.
4) Whenever offering an explanation of why the passage must be interpreted one way, or another, it is necessary that you offer precedents for that interpretation. For example, when offering the explanation that “brethren” refers to a tribe outside of Israel, we need to see examples of this type of application in the Scriptures.
5) The only Scriptures allowed should be the Biblical Scriptures, for these are the only ones that can explain the meaning of the Biblical passage of Deuteronomy. It only follows logic that the author is the only one that can provide enough information in how to interpret his own works. So, only the Biblical authors could explain or help clarify the proper understanding of the passage in Deuteronomy.
6) It is necessary that we do not make unnecessary assumptions about the beliefs of our opposing debater, for assumptions may keep us from being honest in our discussion, and from properly posing convincing arguments.
7) We must refrain from any form of personal attack; we must refrain from calling names.