gorice
Hero
Two readily identified positions on this question are formalist (if the rules are changed, then the game is not being played... a different game is) and non-formalist (what game is played is essentially a normative determination.)
@Imaro seems to adopt a non-formalist position. 5e D&D rules run to hundreds of pages. I don't think anyone plays every rule exactly correctly (or even knows every rule, in my experience.) It's extremely unlikely that any two game of 5e will be identical on the matter of rules. Is there a change where 5e is no longer played? I believe the answer to that is "yes" there will be a point where some abundance of rules are changed and the normal view would be that a new game exists.
I can give some concrete examples. Chivalry and Sorcery is documented to have arisen out of an abundance of change to D&D for the author's home campaign. I think most folk would agree that C&S is a different game from D&D of that era. 2nd edition D&D is a version of D&D, and although it is recognisably D&D, it is recognisably not any other edition of D&D. However, a passerby might just say that folk playing 2nd edition, C&S, or 5th edition are playing D&D. You can see that what counts as playing a given game is normative.
D&D doesn't come with a fixed, written set of principles or agendas. And it expressly authorises folk to change the rules. It offers optional and variant rules. What you are asking for may be a valid question for some RPGs. There is no satisfying answer for D&D.
Right, so, I think we can usefully distinguish between the various rules texts for D&D ('D&D1'), actual instances of play with all their myriad variations ('D&D2'), and the idea of D&D as such ('D&D3'). The problem is: what is the relationship between these three things?So, let us look at that a bit.
You ask folks to "actually read the rules" - we will set aside the possible condescension of that suggestion for the moment - "and you will see they are not the same thing."
Well, of course they aren't exactly the same thing. That's trivial. But we then get to how meaningful the differences are, and upon which differences your argument rests and what you are asserting about those differences.
So, if you are saying, "X and Y are different in <this specific way>, and that is terribly meaningful and it means <specific thing about play>..." and folks disagree with your assessment, you will get pushback. Those asserted meanings often look a lot like gatekeeping, asserting a right and a wrong way to play - which is typically coincidentally aligned to the speaker's own preferences.
To which the collected answer is usually of the form, "For crying out loud, stop telling people how to have their own fun already!
Well, yes, that'll happen when you try to nail people down to defining it as one single thing, when... it isn't one single thing in application.
D&D is a set of rules that can be applied to play an RPG. Those rules are not explicitly proscriptive about what kind of game it can be, or what the goals or style of play will be. As a practical matter we can allow that those rules are better at supporting some styles than others. But, folks have a good time using them over a wide range of playstyles.
Right now, I'm playing in one game that's very dungeon-crawley, combat-on-a-map every session, where most problems are solved by deadly force of arms, and a few are solved by the party Paladin rolling a natural 20 on a persuasion check, much to the party bard's chagrin.
Meanwhile, in a game I am running, the party is almost level 4, and the only things they have killed are two goblins and a gelatinous cube.
Both are very obviously D&D to anyone observing. But they aren't really the same either. Players are having a fine time in both.
Do not confuse "ineffable" with "flexible".
To me, it's self-evident that these categories influence one another, but not completely so. It's also evident that each contains radical amounts of variation (very different rules texts, instances of play, and ideas about what the game actually is).
This means that I don't think you can meaningfully discuss D&D without drilling down to the specifics of the D&D1 and D&D2 in use in a particular instance. My feeling is that people in these discussions often want to start at their personal D&D3, and then take umbrage when something contradicts it.
Anyway, I should probably start a new thread when I want to discuss this sort of thing.