AD&D PHB (1977, p. 76):

Any creature at the edge (1’) of such a pit uses its dexterity score as a saving throw to avoid falling into the hole, with a score equal to or less than the dexterity meaning that a fall was avoided.Looking to support The Tavern? Use our affiliate links and help yourself to some good stuff while helping The Tavern!DTRPG: tenkars-tavern.games/DTRPGHumble Bundle: tenkars-tavern.games/HumbleAmazon: tenkars-tavern.games/AmazonAcorns makes it easy to save and invest. Join me and you'll get a free $5 investment! As a perk of referring users, I can get a reward too. Learn more and see the terms here. https://acorns.com/share/?advocate.partner_share_id=3776334518723731626&shareable_code=84YJGJW