Liu Ren is the most ancient, profound, accurate, and guarded Chinese divination art. Principles of Liu Ren Divination is the first book that systematically introduces Da Liu Ren to the West and is written by Yu Gong, the author of the highly sought-after book Ren Gui: A Collation, Translation, Annotation, and Commentary [壬归校译释论], published in 2012 by Shanghai Academia Press. In this book, Yu Gong gives a comprehensive and detailed study of Liu Ren from its underlying principles to real-world applications.