 Assuming that this "Li Jing Bing Fa" was an edition of "Questions and Replies", the existence of the book precedes the supposed date of Yuan Yi's forgery by ten years.Skepticism that every living general and military scholar could have been deceived by a very recent forgery also fails to support the theory that "Questions and Replies" was forged by Yuan Yi.Regardless of its author and date of authorship, modern military historians recognize the theoretical advances it represents over the other six Military Classics, and recognize that it must be the creation of an advanced and experienced military strategist.