Okay, I think that's almost what I thought. Although, I would articulate it (with much more jargon) as: "
There must be some entrance X for which X can be defeated and can be reached without having to defeat another room first."
This is slightly different in meaning, but I think it better retains the spirit of what the rule is saying, that one room cannot prevent a person from continuing with other rooms, and allows for more flexibility.
I say it like this because there could very easily be separate passages (not necessarily hidden ones) that lead to rooms from other rooms. Since DROD only allows room-to-room movement in four directions, and since there are space limitations here, a passage like this one in level seven of Dugan's
(where 1 is possibly the first entrance to the room) would be useful for distinguishing each individual room. I can't see a reason why these should not be allowed. But if you have a good reason to ban these, I suppose I can live, but it seems that that would result in having to play part of a room before moving on to another one, which seems to stray from the intent of the rule more than these little paths.
Regardless, it's your contest. I'm just trying to help out.
(I'm assuming you mean command-line based system. Does that mean you're using a Linux box that isn't running X? Just curious.)
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, so I'm posting it over 
