the roots of the rpg hobby

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The original was posted on /r/osr by /u/Old_Dirty_Grognard on 2023-09-20 05:53:53.

I have asked this before and didn't really get a good answer, so I ask again. In OSE on the encounter sequence surprise is checked before checking distance. Where as in B/X distance is checked first and then surprise. What would be the advantage of doing it the OSE way and how would it play out if let's say you rolled for surprise and the monsters where surprised and the PC's were not, and then you roll for distance and got two one's and the monsters are 20 feet away?