Unlike solo wargaming with miniatures, within the last few years solo RPG-ing turned into rather exact science.
The player uses Oracle, different randomizers and maybe some driver engine, and he knows exactly what to do and how to do it.
And as it is the case with every exact science, new works in domain are not breath taking exploits into unknown, but rather small steps that improve and deeper our understanding of the subject.
So, the latest contribution in the field of solo RGD-ing is Conjectural Roleplaying Gamemaster Emulator (CRGE) by Zack Best (Conjecture games).
The most innovative part within CRGE is a d100 Oracle, which is called The Loop of Fate. Unlike the oracles we are most used to, it does not take into consideration the probability of the event. Instead, three tables within the oracle are chosen based on the scene set-up: one is for scenes where players are trying to gain knowledge, one is for scenes leading into conflict and one is for scenes that should wrap up the adventure.
Each table has eighth possible outcomes. Besides six commonly known (yes and, yes but, yes, no, no but, no and) The Loop of Fate uses two more - Yes and unexpectedly and No and unexpectedly. The Unexpectedly result is further elaborated in additional d20 table and makes good sense.
Another interesting thing is called the Surge Count. Basically, each time the plain yes and plain no is rolled on the oracle, a counter is increased. This counter value is than added to or subtracted from further rolls on the oracle to drive the final result towards some twists. This is the good mechanics that can improve quality of one's game.
CGRE also implements a little vague driver that divides game into 3 or 4 small acts: exposition, rising action, climax and (optional) epilogue.
The rest of the booklet is basically compilation work from lots of different sources. It is done well, and CRGE can be good starting point for beginners, even if the experience players will already be familiar with most of the stuff.
In any way, considering the price (booklet is Pay What you Want on Drive Thru RPG) it is another must have for all solo RPG players.