Scarlet Heroes RPG
From the description:
Scarlet Heroes is an old-school tabletop role-playing game designed to provide classic sword and sorcery gaming for one player and one gamemaster. Unlike most other RPGs, Scarlet Heroes is built to support one-on-one play, with no need for a full-fledged party of adventurers to provide an evening's entertainment. Whether for a spouse, kid, curious friend, or just as an alternative to boardgames for those nights when only one or two friends can make it to the gaming session, Scarlet Heroes gives you the tools for good old-fashioned skull-cracking adventure.
Scarlet Heroes can be used both as a stand-alone RPG and as an overlay over your favorite old-school game to make its adventures playable for single PCs or very small groups. It shares the same classic statistics and basic game mechanisms as these old-school favorites, but by changing the interpretation of these numbers it makes it possible for a single courageous adventurer to dare perils that would otherwise threaten a half-dozen freebooters. With Scarlet Heroes, a GM can pull out a favorite module, grab a convenient friend, and a have a full night's adventure with no tweaking, alteration, or adjustment of the material needed.
