There are solo rules (which I use slightly modified) in "The Ogre Book"
So, what we have so far is :
"The Uncertainty Principle" by Brian McCue HERE
"Humans against the Ogre - programmed to kill!" by George Collins in The Space Gamer #35.
"Solo rules" by Brian Sturk in "The Ogre Book".
Has anyone seen them all? Are they a modification of each other or a different set of rules? A comment on gameplay would be great.